Model reference

Frigidaire FFMS181CQ2

Air Conditioner

1 document49 error codes4 service modes

Available documentation

Service Manual

Technical Service Manual 2015 Split Type120 pg
Covers this model

MyPros+ Max

Diagnose your Frigidaire FFMS181CQ2.

Step-by-step diagnostics from the service manual
Test values, resistance specs, and wiring references
Verified part numbers when replacement is needed

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M+

M+ Max·Frigidaire Air Conditioner

C5 on my Frigidaire FFMS181CQ2

M+

Jumper cap malfunction protection – no

From Service Manual 512838, p.50:

1.Access service mode to confirm the active fault code and read stored error history.

2.Measure control board supply voltage at test points. Expected: 12 VDC and 5 VDC.

3.Inspect all connectors on the main control for corrosion or backed-out pins.

Part 5304504863

Electronic control board

Error codes (49)

CodeMeaning

C5Jumper cap malfunction protection E1System high pressure protection E2Anti-freezing protection E3System low pressure protection E4Compressor high discharge temperature protection.E5AC overcurrent protection E6Communication malfunction between indoor and outdoor units.E8High temperature resistant protection (overload/high temperature).EEEEPROM malfunction on outdoor control panel.EULimit/decrease compressor frequency due to high IPM module temperature.F1Indoor ambient temperature sensor open or short circuited.F2Indoor evaporator (tube) temperature sensor open or short circuited.F3Outdoor ambient temperature sensor open or short circuited.F4Outdoor condenser temperature sensor open or short circuited.F5Outdoor discharge temperature sensor open or short circuited.F6Limit/decrease compressor frequency due to overload condition.F8Decrease compressor frequency due to overcurrent F9Decrease compressor frequency due to high discharge temperature FHLimit/decrease compressor frequency due to anti-freezing protection FoRefrigerant gathering/recovery mode H0Decrease compressor frequency due to high temperature resistant during heating…H1Defrosting mode H2Static dedusting protection.H3Compressor overload protection.H4System abnormal H5IPM module protection.H6Indoor fan motor locked/blocked protection H7Compressor desynchronizing (loss of synchronism) protection.HCPFC (Power Factor Correction) protection.L3Outdoor DC fan motor malfunction

View all 49 error codes

L9Power protection LCCompressor failure start-up (start-up failure).LPIndoor unit and outdoor unit do not match.P0Compressor minimum frequency test state.P1Compressor rated frequency test state.P2Compressor maximum frequency test state.P3Compressor intermediate frequency test state.P5Overcurrent protection of compressor phase current.P7Module temperature sensor circuit malfunction.P8Module high temperature protection PHDC bus-bar voltage too high.PLDC bus-bar voltage too low.PUCapacitor charging malfunction on outdoor unit.U1Compressor phase current detection circuit malfunction.U3DC bus-bar voltage dips/sag U5Malfunction of complete unit current detection circuit on outdoor unit.U7Four-way valve abnormal U8Zero-crossing inspection circuit malfunction of IDU fan motor U9Outdoor unit zero-crossing detection malfunction / whole unit current testing…

Service modes (4)

Compulsory Defrosting1
Failure Remote Calling (Error Code Display via Remote)Push the 'Light' button 4 times within 3 seconds to call out relevant failure protection codes on…
Forced Running / Fast Test (Indoor Unit)1
Refrigerant Recovery (Fluorine Collecting)1

Full entry steps, exit procedures, and test sequences are available in Max.

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