Breast pumps · Symphony family

Medela Symphony: troubleshooting and error codes

The ServiceForge knowledge base holds 17 documented symptoms for the Medela Symphony, with 31 ranked causes, 22 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

Low or no suction

Symphony breast pump produces low or no suction output during operation

Ranked causes

1. Worn or torn membranes (common)
2. Worn or torn diaphragms (common)
3. Lid does not completely close (occasional)
4. Tubing not fitted securely (occasional)
5. Triangular end not in membrane cap (occasional)
6. Yellow valve not fitted correctly (occasional)
7. White membrane not lying flat (occasional)
8. Low vacuum level (occasional)

First check

Inspect Symphony Membranes for wear or damage

Test point: Membranes
Expected: No rip or tear visible

7 more checks with pass and fail actions, 8 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Program card issue detected

LCD display indicates problem with program card recognition, insertion, or damage

Ranked causes

1. Wrong program card used (common)
2. Program card incorrectly positioned (common)
3. Program card damaged (occasional)
4. Program card not inserted (common)
5. Program card partially inserted (common)

First check

Verify program card is installed

Test point: Card slot
Expected: Symphony program card fully inserted

2 more checks with pass and fail actions, 5 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Unit does not power on

Symphony breastpump has no power; does not turn on when plugged in

Ranked causes

1. Power cord damaged (common)
2. Power outlet non-functional (common)
3. Fuse is open or shorted (occasional)
4. Short black cord disconnected (occasional)

First check

Visually inspect power cord for damage

Test point: Entire power cord from plug to unit
Expected: No cuts, burns, exposed wires, or damage visible

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

Battery completely discharged

LCD display shows 'Battery Flat'; pump issues long beep and switches off automatically

Ranked causes

1. Battery fully depleted (common)

First check

Check power outlet connection

Test point: Pump connector and wall outlet
Expected: Power cord properly connected to outlet

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

Battery low warning

LCD display shows 'Battery Low' message; pump beeps every 20 seconds indicating low battery

Ranked causes

1. Battery charge depleted (common)

First check

Verify power cord connection

Test point: Pump back connector and wall outlet
Expected: Power cord plugged in at both ends

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

Gear control electronics fault

Potential fault detected in electronics controlling gear drive system

Ranked causes

1. Gear control circuit malfunction (rare)

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

Menu Code: Battery Flat (B/F)

Service menu code B/F indicates battery was fully discharged at some point

Ranked causes

1. Battery fully discharged; possible battery degradation (common)

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Menu Code: Battery Low (B/L)

Service menu code B/L indicates battery was low at some point

Ranked causes

1. Battery charge low; needs recharging (common)

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Menu Code: Configuration Fault (C/F)

Service menu code C/F indicates software configuration issue detected

Ranked causes

1. Software configuration corrupted or invalid (occasional)

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Menu Code: Invalid Card (C/I)

Service menu code C/I indicates historic invalid or corrupted program card detected

Ranked causes

1. Program card orientation incorrect or card corrupted (common)

4 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Menu Code: Motor Fault (M/F)

Service menu code M/F indicates historic motor fault detected

Ranked causes

1. Motor circuit fault or connection issue (occasional)

First check

Power cycle pump

Test point: Power connector
Expected: Pump powers off and back on normally

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Menu Code: Motor Overload (M/O)

Service menu code M/O indicates historic motor overload event

Ranked causes

1. Motor drew excessive current (occasional)

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

Menu Code: No Card (C/N)

Service menu code C/N indicates program card was not detected at some point

Ranked causes

1. Program card not installed or not fully inserted (common)

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Menu Code: Power Fault (P/F)

Service menu code P/F indicates power supply fault detected

Ranked causes

1. Power cord not properly connected or outlet defective (common)

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Motor drawing excessive current

LCD display indicates motor is drawing too much current during operation

Ranked causes

1. Motor overload or internal fault (rare)

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

Power supply electronics fault

Potential fault detected in power supply electronics

Ranked causes

1. Power supply circuit malfunction (rare)

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

Software configuration error

LCD displays software configuration error code

Ranked causes

1. Corrupted software configuration on program card (occasional)

First check

Reboot pump with new program card

Test point: Card slot and display
Expected: Pump boots without configuration error

1 corrective action and part numbers 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.