Whirlpool W4GH6 VAC Power Wiring, Thermostat Demand Wiring, Flash Codes, LED Status

Flash Codes

LED Status	Fault Description	Troubleshooting Information
Alert (Yellow) Flash Code 3	Short Cycling: Compressor is	■	Thermostat demand signal is intermittent.
	running only briefly.	■	Time delay relay or control board is defective.
		■ If high pressure switch is present, go to Flash Code
			2 information.
		■ If low pressure switch is present, go to Flash Code
			1 information.
Alert (Yellow) Flash Code 4	Locked Rotor	■	Run capacitor has failed.
		■ Low line voltage (contact utility if voltage at disconnect is low).
		■ Excessive liquid refrigerant in the compressor.
		■ Compressor bearings are seized.
Alert (Yellow) Flash Code 5	Open circuit	■	Outdoor unit power disconnect is open.
		■ Compressor circuit breaker or fuse(s) is open.
		■ Compressor contactor has failed to open.
		■ High pressure switch is open and requires manual reset.
		■ Open circuit in the compressor supply wiring or connections.
		■ Unusually long compressor protector reset time due to the
			extreme ambient temperature.
		■ Compressor windings are damaged.
Alert (Yellow) Flash Code 6	Open Start Circuit: Current	■	Run capacitor has failed.
	only in run circuit.	■	Open circuit in the compressor start wiring or connections.

■ Compressor start winding is damaged.

Alert (Yellow) Flash Code 7

NOTE: This code will flash within 5 minutes of power interruption until the 5 minute short cycle timer has elapsed. Allow at least 5 minutes of run time before confirming this code.

Open Run Circuit: Current	■	Open circuit in the compressor run wiring or connections.
only in start circuit	■	Compressor run winding is damaged.

Alert (Yellow) Flash Code 8	Welded Contactor:	■	Compressor contactor has failed to close.
	Compressor always runs.	■	Thermostat demand signal not connected to the module.
Alert (Yellow) Flash Code 9	Low Voltage: Control circuit	■	Control circuit transformer is overloaded.
	less than 17 VAC	■	Low line voltage (contact utility if voltage at disconnect is low).
24 VAC Power Wiring			Thermostat Demand Wiring

The diagnostic module requires a constant nominal 24 VAC power supply. The wiring to the module’s R and C terminals must be directly from the indoor unit or thermostat. The module cannot be powered by R and C terminals on the defrost board without experiencing nuisance alerts.

The diagnostic module requires a thermostat demand signal to operate properly. The thermostat demand signal input, labeled Y on the module, should always be connected to the compressor contactor coil so that when the coil is energized, the demand signal input is 24 VAC. When the coil is not energized, the demand signal input should be less than 0.5 VAC.

16