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Heat Controller, Inc. VMH SerieS Service Manual
9. Troubleshooting
9.1 Indoor Mini-Split error code explanations:
Indoor Error
Code
LED STATUS
Corresponding
Outdoor Error code
E0
Indoor EEPROM malfunction ——
E1 Indoor/ outdoor unit communication error ——
E2 Zero-crossing signal error ——
E3 Indoor fan speed has been out of control ——
E5
Open circuit or short circuit of outdoor temperature sensor or outdoor
EEPROM malfunction
E0,E1,E2,
E3,E4,E6
E6 Open circuit or short circuit of T1 or T2 temperature sensor ——
P0 IPM module protection or IGBT over-strong current protection P4
P1 Voltage protection E5
P2 Temperature protection of compressor top P0,P1,P2
P3 Outdoor temp. too low protection(Optional for some models) ——
P4 Inverter compressor drive protection E7, P7
P5 Mode conflict ——
Indoor Ceiling Cassette error codes:
Operation Timer De-frost Alarm LED STATUS
★
X X X Open or short circuit of T1 temperature sensor
X X
★
X Open or short circuit of T2 temperature sensor
X
★
X X Indoor / outdoor units communication error
X X X
★
Full-water malfunction
★ ★
X X Indoor EEPROM malfunction
★
X X
IPM module protection
★
X X Open or short circuit of T3 or T4 temperature sensor
★
X
Voltage protection
★ ★ ★ ★
Temperature protection of compressor top.
★
X
Mode conflict
★
X Inverter compressor drive protection
★ flash at 2.5Hz, light, X extinguished.