Test equipment tonometers

Reichert TONO-PEN AVIA: troubleshooting and error codes

The ServiceForge knowledge base holds 12 documented symptoms for the Reichert TONO-PEN AVIA, with 21 ranked causes, 26 diagnostic checks with test points and expected values, and 9 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

Multiple inaccurate readings patient safety

Device produces inconsistent or incorrect tonometry measurements

Ranked causes

1. Improper technique (common)
2. Old or improperly applied Ocu-Film + tip cover being used, or non-Reichert tip cover (common)
3. Debris in tip (common)
4. Mechanical or electronic damage (occasional)

First check

Review measurement technique

Test point: Operator technique
Expected: Proper force, duration, and perpendicular angle applied

3 more checks with pass and fail actions, 4 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Inaccurate IOP measurement data

Device displays incorrect intraocular pressure readings after applanation

Ranked causes

1. Electrostatic Discharge (ESD) event (rare)
2. Device shaken during measurement (occasional)
3. Excessive force or indentation on cornea (occasional)

First check

Allow instrument to thermally stabilize

Test point: Room temperature
Expected: Device at room temperature for approximately 30 minutes before use

2 more checks with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

No beeps and/or no dashes upon activation

Device does not produce beeps or display dashes when activation button is pressed

Ranked causes

1. Activation button not properly pressed (common)
2. No Tono-Pen AVIA POWERCEL Battery capacity (common)
3. Mechanical or electronic damage (occasional)

First check

Press activation button

Test point: Activation button
Expected: Beeps sound and dashes appear on LCD

2 more checks with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Verification Failure patient safety

Device fails internal verification check

Ranked causes

1. Debris in tip (common)
2. Compressed air cleaning has lowered the temperature of the instrument (occasional)

First check

Inspect tonometer tip for debris

Test point: Tip surface
Expected: Clean, debris-free surface

1 more check with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Verification test fails

Display shows [FAIL] after pressing activation button during verification mode; device remains in verification mode until test passes

Ranked causes

1. Debris in Transducer Assembly tip (common)
2. Transducer Assembly or electronics malfunction (rare)

First check

Hold tonometer with Transducer Assembly pointing down

Test point: Device orientation
Expected: Transducer Assembly pointing down towards floor

3 more checks with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Battery level critical

Battery symbol flashes on LCD indicating critically low battery charge

Ranked causes

1. Battery depleted or near end of life (common)

First check

Observe battery symbol on LCD

Test point: LCD battery indicator
Expected: Battery symbol shows all segments; no flashing

2 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Battery symbol flashes

Battery indicator shows low battery after pressing activation button

Ranked causes

1. Low Tono-Pen AVIA POWERCEL Battery capacity (common)

First check

Observe battery indicator after pressing activation button

Test point: LCD display
Expected: Battery symbol flashing

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Difficulty taking measurements or erratic readings

Tonometer may display inaccurate data, fail verification, or have difficulty taking measurements

Ranked causes

1. Dirty Transducer Assembly tip with contaminants (common)

First check

Visually inspect Transducer Assembly tip for dirt and contaminants

Test point: Transducer Assembly tip
Expected: Clean tip with no visible debris

1 more check with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Failed self-test at power-up

LCD displays error indicating device failed self-test during power-up; device may not be functional

Ranked causes

1. Internal electronics or sensor malfunction (rare)

First check

Observe LCD display at power-up

Test point: LCD self-test result display
Expected: Passed Battery Life Test and Passed LCD Test; transition to Applanation Mode

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Insufficient applanations collected; measurement timeout

Display shows timeout error when fewer than 6 applanations are collected within 15 seconds

Ranked causes

1. Insufficient applanations during 15-second window (occasional)

First check

Initiate applanation mode within 15 seconds of activation button press

Test point: Activation button to first applanation
Expected: First applanation within 15 seconds; minimum 6 applanations needed for valid result

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

IOP value out of range

Display shows error when measured IOP is less than 5 mm Hg or greater than 55 mm Hg

Ranked causes

1. Invalid measurement (unknown)

First check

Verify measurement error code

Test point: LCD display
Expected: Error - IOP value Under Range or Over Range displayed

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Low statistical confidence in IOP measurement

Statistical confidence indicator shows 80 or less, indicating high measurement variability

Ranked causes

1. High variability in applanation readings (unknown)

First check

Review statistical confidence indicator

Test point: LCD confidence value display
Expected: Confidence indicator 95 indicates standard deviation 5% or less; 80 or below indicates high variability confidence, >=95 preferred

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Error codes

Code	Meaning	Trigger	Severity
`Battery Level Critical`	Battery charge critically low; device may power off unexpectedly	Battery voltage drops below minimum operating threshold; symbol flashes on LCD	critical
`[dn]`	Verification mode - tonometer held with Transducer Assembly pointing down	Displayed after pressing and holding activation button for 5 seconds during verification test	info
`Error - IOP Value Over Range`	Measured IOP above valid range; reading invalid	Applanation mode completes with measured pressure greater than 55 mm Hg	error
`Error - IOP value Under Range`	Measured IOP below valid range; reading invalid	Applanation mode completes with measured pressure less than 5 mm Hg	error
`[FAIL]`	Verification test unsuccessful; device performance compromised	Tonometer fails to complete verification test correctly or displays error during sequence	error
`Failed Self Test`	Device internal self-test failed during power-up; electronics or sensors not functioning	Device power-up self-test detects internal malfunction	critical
`[PASS]`	Verification test successful; device functioning correctly	Tonometer successfully completes verification test sequence	info
`Timeout - not enough IOP values collected`	Measurement incomplete; insufficient valid applanations obtained within time limit	Fewer than 6 applanations collected before 15-second measurement window expires	warning
`[UP]`	Verification mode - tonometer ready to be inverted	Displayed after holding tonometer vertical pointing down for 15 seconds	info

Likely causes and actions for each code are in ServiceForge. Connect ServiceForge to your AI

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.