Heat Controller VMH18SC-1, VMH12SC-1 Igbt over current protection diagnosis and solution

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Heat Controller, Inc.	VMH Series	Service Manual

E5 & E6

9.2.5 Open or short circuit of temperature sensor diagnosis and solution

Check the connections between the sensors and the PCB. Are the connections good?

Yes
	Yes
Replace the sensor and check if	Yes
E5 or E6 displays again?

P0:

9.2.6 IGBT over current protection diagnosis and solution

Check whether the connections between outdoor PCB and IPM are good?

Yes
	No
Check whether the IPM is fixed to radiator	No
tightly

Replace the outdoor or

indoor PCB

Fastening the IPM to the radiator

Replace the IPM

The unit does not work normally

Replace the compressor

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Contents Inverter Single Zone Ductless Mini Split Heat Pump Contents Precaution Safety Precaution Installation  For installation, always contact the dealer  Caution  Do not block the inlet or outlet of air flow  Keep level even when installing the product Operational  Use two or more people to lift and transport the product Do not drink the water drained from the product Anti-freeze protection in cooling FunctionOutdoor unit Compressor delay Indoor Unit DimensionOutdoor Unit Model Dimension mmIndoor Outdoor Refrigerant Cycle DiagramWiring Diagrams VMH09SC-1 A-VMH12SC-1 VMH18SC-1 Installation details Single Zone V Series Inverter System Pipe length and the elevationSystem Evacuation and Charging Pressure Test & EvacuationOperation characteristics Electronic function AbbreviationDisplay function Main Protection Preheat termination Preheat modeFan only mode Operation Modes and FunctionsCooling Mode Compressor running rules Model Current Frequency decreases HoldsCondenser high temperature T3 protection Outdoor fan rulesIndoor fan running rules Heating Mode Compressor running rules Evaporator low temperature T2 protectionT1-Ts-ΔT +5.0 +4.5 +3.5 +3.0 +2.5 +2.0 +1.5 +1.0 +0.5 Outdoor fan running rules I1HEAT I2HEAT I3HEATVMH18SC-1 Indoor fan rulesUnit TEL0 TEL1 VMH09SC-1 VMH12SC-1Defrost mode： Defrost Actions For 9K and 12K unit For 18K and 24K unit Auto-mode High evaporator coil temp.T2 protectionForced operation function Dehumidify modeSleep function mode Timer functionIonizer Clean Air function Auto-Restart functionAutomatic front panel function Safety TroubleshootingIndoor Unit Error Display Diagnosis and SolutionEeprom parameter error diagnosis and solution VMH Series E3 Indoor or E7 Outdoor Igbt over current protection diagnosis and solution VMH Series Inverter compressor drive error diagnosis and solution 29 P3 Error Low Ambient ProtectionPosition Resistance Value Key parts checkingVMH Series Some frequently-used R-T data for T1, T2, T3 and T4 sensor 2012