Air compressors

Midmark AMD-100-2: troubleshooting and error codes

The ServiceForge knowledge base holds 46 documented symptoms for the Midmark AMD-100-2, with 47 ranked causes, 45 diagnostic checks with test points and expected values, and 0 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

Dryer tank saturated with moisture

Moisture indicator pink or white; system humidity excessive; dryer tank failing

Ranked causes

1. Dryer desiccant saturated; tank life expired (occasional)
2. Excessive moisture in compressed air (occasional)

First check

Inspect moisture indicator color

Test point: Moisture indicator window
Expected: Blue

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Air intake filter contaminated

Air intake filters become clogged with debris and dust, reducing compressor intake efficiency.

Ranked causes

1. Normal dust and debris accumulation in intake filters (common)

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Air intake filter contamination

Air intake filters require cleaning or replacement due to dust and debris accumulation

Ranked causes

1. Normal filter loading from air intake (common)

First check

Inspect air intake filters for contamination

Test point: Air intake filter elements
Expected: Clean, free of visible dust and debris

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Air intake filters clogged

Filters restrict airflow and reduce compressor efficiency; visual inspection or performance degradation

Ranked causes

1. Normal dust and debris accumulation (common)

First check

Inspect air intake filters for dirt and clogging

Test point: 5 air intake filters
Expected: Clean, not visibly clogged

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Air intake filters dirty caution

Intake filters clogged with debris; reduced air intake or compressor performance

Ranked causes

1. Dust and debris accumulation in intake filters (common)

First check

Inspect air intake filters for dirt and clogging

Test point: 5 intake filters
Expected: Clean, unobstructed

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Air intake filters dirty or clogged caution

Air intake filters require periodic cleaning and replacement to maintain air quality and compressor efficiency.

Ranked causes

1. Air intake filters require cleaning or replacement (common)

First check

Inspect air intake filters for dirt and debris

Test point: 5 air intake filters
Expected: Filters clean with no visible blockage

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Air intake filters require cleaning

Air intake filters need maintenance after extended use period

Ranked causes

1. Scheduled maintenance interval reached (common)

First check

Inspect condition of air intake filters

Test point: Air intake filters (5)
Expected: Clean, unrestricted airflow

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Coalescing filter indicator red during operation

Coalescing filter indicator shows red color while compressor is running, indicating need for replacement

Ranked causes

1. Coalescing filter saturated or expired (common)

First check

Observe coalescing filter indicator color

Test point: Coalescing filter indicator
Expected: Red indicator visible during operation

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Coalescing filter indicator turns red

Red indicator on coalescing filter appears while compressor is running, signaling maintenance requirement

Ranked causes

1. Coalescing filter saturated or contaminated (common)

First check

Inspect coalescing filter indicator color

Test point: Coalescing filter indicator
Expected: Red indicator visible

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Coalescing filter needs replacement

Coalescing filter indicator turns red during compressor operation; moisture separation may be compromised

Ranked causes

1. Coalescing filter saturated or degraded (common)

First check

Observe coalescing filter indicator color

Test point: Coalescing filter indicator
Expected: Not red while compressor is running

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Coalescing filter requires replacement

Moisture indicator on coalescing filter has turned red while compressor is running, indicating saturation.

Ranked causes

1. Coalescing filter saturated or service life expired (common)

First check

Observe coalescing filter indicator color

Test point: coalescing filter indicator
Expected: Indicator not red

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Coalescing filter saturated

Moisture indicator turns red during operation; filter unable to remove moisture from compressed air

Ranked causes

1. Normal moisture accumulation in compressed air (common)

First check

Observe moisture indicator on coalescing filter during compressor operation

Test point: Coalescing filter indicator
Expected: Not red while compressor running

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Coalescing filter saturated with moisture and oil caution

Coalescing filter removes moisture and oil from compressed air; replacement required when indicator turns red during operation or at scheduled intervals.

Ranked causes

1. Coalescing filter saturated; indicator turns red (common)

First check

Inspect coalescing filter indicator color while compressor running

Test point: Coalescing filter indicator
Expected: Indicator not red; if red, filter is saturated

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Coalescing filter saturation

Coalsecing filter requires replacement when saturation indicator turns red or at scheduled interval

Ranked causes

1. Filter loading from moisture and oil aerosol (common)

First check

Observe coalescing filter saturation indicator

Test point: Coalescing filter indicator
Expected: Red indicator visible while compressor is running or 6 months elapsed

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Compressor moisture indicator showing saturation

Moisture indicator in dryer tank shows the condition of the desiccant cartridge; color indicates remaining life of dryer media.

Ranked causes

1. Desiccant cartridge in dryer tank exhausted; indicator white (occasional)

First check

Inspect moisture indicator color in dryer tank

Test point: Moisture indicator in dryer tank
Expected: Blue indicates dryer OK; pink indicates marginal life; white indicates replacement needed

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Dirty air intake filters

Air intake filters visibly clogged or airflow restricted; compressor may run hotter or noisier than normal.

Ranked causes

1. Accumulated dust and debris in filters (common)

First check

Inspect air intake filters for dirt and debris

Test point: 5 air intake filters
Expected: Clean, no visible blockage

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Dryer tank moisture saturated

Moisture indicator on dryer tank shows pink (marginal life) or white (replacement needed); affects air quality

Ranked causes

1. Moisture accumulation in dryer tank during operation (common)

First check

Check moisture indicator color on dryer tank

Test point: Dryer tank moisture indicator
Expected: Blue

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Dryer tank moisture saturation

Desiccant in dryer tank becomes saturated with moisture, indicated by color change of moisture indicator.

Ranked causes

1. Normal moisture absorption by desiccant in dryer tank (common)

First check

Inspect moisture indicator color

Test point: Moisture indicator on dryer tank
Expected: Blue = OK; Pink = marginal life remaining; White = replacement needed

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Dryer tank nearing end of service life

Moisture indicator has turned white, signaling that the desiccant in the dryer tank is exhausted and no longer removes moisture from compressed air.

Ranked causes

1. Desiccant in dryer tank exhausted (common)

First check

Verify moisture indicator color on dryer tank

Test point: moisture indicator
Expected: Blue

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Dryer tank saturation

Moisture indicator shows pink or white color

Ranked causes

1. Dryer desiccant saturated with moisture (occasional)

First check

Observe moisture indicator color

Test point: Moisture indicator
Expected: Blue (system dryer OK)

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Excessive oil loss from compressor caution

Compressor oil drains from both compressor heads via drain plugs; incomplete drainage during maintenance can lead to oil loss and inadequate lubrication.

Ranked causes

1. Compressor not tilted sufficiently during oil drain; oil remains in heads (occasional)

First check

Verify compressor is tilted to 45 degrees during oil drain

Test point: Compressor orientation and drain plugs
Expected: Compressor tilted 45 degrees; oil drains completely from both heads

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Moisture indicator pink

Moisture indicator shows pink color, indicating marginal desiccant life remaining in dryer tank

Ranked causes

1. Dryer tank desiccant nearing end of life (common)

First check

Inspect moisture indicator color

Test point: Moisture indicator
Expected: Pink color

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Moisture indicator white

Moisture indicator shows white color, indicating dryer tank desiccant is exhausted and requires replacement

Ranked causes

1. Dryer tank desiccant exhausted (common)

First check

Inspect moisture indicator color

Test point: Moisture indicator
Expected: White color

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Oil contamination or excessive moisture in compressor heads

Oil not draining completely during maintenance; contaminated or diluted oil reduces lubrication effectiveness.

Ranked causes

1. Oil not fully drained at improper angle (common)

First check

Position compressor and open oil drain plugs

Test point: oil drain plugs
Expected: Oil flows completely; no oil remains when plugs reopened

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Oil disposal required caution

Oil must be drained from compressor during maintenance; proper containment needed

Ranked causes

1. Routine oil change or maintenance procedure (common)

First check

Position compressor for complete oil drainage

Test point: Compressor orientation at drain plugs
Expected: Compressor tilted 45 degrees; all oil flows to drain pan

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Oil drain and system maintenance

Compressor oil requires periodic draining to remove accumulated contaminants; tilting aids complete drainage

Ranked causes

1. Normal oil degradation and contamination during operation (common)

First check

Tip compressor to 45 degrees and monitor oil drain

Test point: Oil drain plugs
Expected: All oil completely drained from system

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Oil drain incomplete

Oil not fully drained from compressor heads during maintenance

Ranked causes

1. Compressor not sufficiently tilted during drain (common)

First check

Verify compressor orientation during oil drain

Test point: Compressor body angle relative to horizontal
Expected: 45 degrees tilt to facilitate complete oil drainage

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Oil drain not complete caution

Oil not fully drained from compressor during maintenance, compromising proper oil fill procedure

Ranked causes

1. Improper compressor orientation during oil drain (occasional)

First check

Drain oil from compressor at correct angle

Test point: Oil drain plugs
Expected: All oil completely drained when compressor is tilted to 45 degrees

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Oil level below minimum caution

Oil level in compressor heads requires regular monitoring to maintain proper lubrication; level should be maintained between ½ and ¾ on the sight glass.

Ranked causes

1. Insufficient oil in compressor head (common)

First check

Inspect oil level on sight glass

Test point: Sight glass on each compressor head
Expected: Oil level between ½-¾ on sight glass

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Oil level low

Oil level on site glass below ½-¾ mark

Ranked causes

1. Oil consumption or leakage (unknown)

First check

Observe oil level on site glass

Test point: Oil level sight glass
Expected: ½-¾ full

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Oil level low in compressor head

Oil level below ½ on site glass; requires refilling to maintain proper lubrication

Ranked causes

1. Oil consumption during operation (common)

First check

Check oil level in compressor head

Test point: Site glass
Expected: ½-¾ on site glass

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Oil level low on sight glass

Oil level not at ½-¾ mark on site glass; may indicate insufficient lubrication or oil leakage from compressor head.

Ranked causes

1. Insufficient oil in head (common)

First check

Verify oil level on sight glass

Test point: site glass
Expected: ½-¾ full

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Oil level low or incorrect caution

Oil level on site glass not maintained between ½ and ¾ mark; insufficient lubrication of compressor heads

Ranked causes

1. Insufficient oil fill in compressor heads (common)

First check

Check oil level on site glass

Test point: Site glass
Expected: Oil level between ½ and ¾ mark

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Pressure relief valve function check caution

Safety valve may not operate properly; tested by manual actuation to verify relief mechanism

Ranked causes

1. Pressure relief valve stuck or inoperative (occasional)

First check

Manually actuate pressure relief valve by pulling on ring

Test point: Pressure relief valve ring
Expected: Valve releases pressure smoothly when pulled

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Pressure relief valve function test needed caution

Monthly test of pressure relief valve operation

Ranked causes

1. Valve may be stuck or not functioning (occasional)

First check

Pull pressure relief valve ring to test function

Test point: Pressure relief valve
Expected: Valve opens and relieves pressure; returns to closed position

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Pressure relief valve not functioning caution

Pressure relief valve may be stuck or unable to open; system overpressure could occur.

Ranked causes

1. Pressure relief valve stuck or contaminated (occasional)

First check

Manually test pressure relief valve

Test point: pressure relief valve ring
Expected: Valve opens when pulled; audible or visible pressure release

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Pressure relief valve performance degradation caution

Pressure relief valve may not open properly to relieve excess system pressure

Ranked causes

1. Valve stiction, contamination, or spring failure (occasional)

First check

Manually test pressure relief valve function

Test point: Pressure relief valve ring actuator
Expected: Air escapes audibly when ring is pulled

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Pressure relief valve requires testing caution

Pressure relief valve functional test is due

Ranked causes

1. Scheduled monthly pressure relief valve test (common)

First check

Pull pressure relief valve ring

Test point: Pressure relief valve ring
Expected: Valve vents pressure audibly or visible discharge

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System air leak caution

Pressure loss in the air system indicating air escape at connections or seals

Ranked causes

1. Loose fittings, degraded seals, or component failure (occasional)

First check

Perform leak test of entire air system

Test point: All system connections and seals
Expected: No visible air leakage or hissing sounds

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System air leaks

Potential leaks in compressor system piping and connections; reduces system pressure and efficiency

Ranked causes

1. Worn seals or loose fittings (occasional)

First check

Perform leak test on entire system using pressure gauge

Test point: All system connections and piping
Expected: No air leaks detected

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System leak detected

Leak test reveals air or fluid loss from compressor system

Ranked causes

1. Scheduled leak test indicates system leak (occasional)

First check

Perform leak test on system

Test point: System pressure points
Expected: No pressure loss over test period
Tools: Pressure gauge

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System leak present

Compressed air escaping from system connections or components; pressure loss and reduced compressor efficiency.

Ranked causes

1. Loose or damaged fittings or seals (occasional)

First check

Leak test all system connections and fittings

Test point: compressor system
Expected: No audible or visible air escape
Tools: Pressure gauge

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System leak suspected caution

Air or fluid leaking from compressor system connections or components

Ranked causes

1. Loose fittings or seal degradation (occasional)

First check

Leak test the complete system

Test point: All system connections and fittings
Expected: No visible leaks or pressure loss

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System leaking compressed air

Loss of pressure; suspected leak in lines or connections

Ranked causes

1. Leaking connections or line damage (occasional)

First check

Perform system leak test

Test point: All connections and fittings
Expected: No leaks; pressure stable

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System pressure leak detected

Compressed air system loses pressure due to leaks in connections, fittings, or seals.

Ranked causes

1. Leaks in compressed air system connections or seals (occasional)

First check

Perform leak test on system

Test point: Entire compressed air system
Expected: No pressure loss detected during leak test

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System pressure leak suspected caution

Potential loss of system pressure

Ranked causes

1. System seal wear or connection degradation (occasional)

First check

Test system for leaks using pressure gauge

Test point: System connections and seals
Expected: No pressure loss over monitoring period

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Community

0 fixes logged by technicians through their AI, with outcomes, for this model.

ServiceForge knowledge base record. Field-unverified unless technicians confirmed it. A teaching summary of the record, not a service manual. Export 2026-10-14.