Bard WH183, WH242 installation instructions Table Troubleshooting

TROUBLESHOOTING

SOLID STATE HEAT PUMP CONTROL TROUBLESHOOTING PROCEDURE

1.Turn on AC power supply to indoor and outdoor units.

2.Turn thermostat blower switch to “fan on” – the indoor blower should start. (If it doesn’t, troubleshoot indoor unit and correct problem.)

3.Turn thermostat blower switch to “auto” position. Indoor blower should stop.

4.Set system switch to “heat” or “cool”. Adjust thermostat to call for heat or cool – the indoor blower, compressor and outdoor fan should start.

NOTE: If there was no power to 24 volt transformer, the compressor and outdoor fan motor will not start for 5 minutes. This is because of the compressor short cycle protection.

TABLE 5

TROUBLESHOOTING

SYMPTOM	POSSIBLE CAUSES	WHAT TO CHECK	HOW TO CHECK OR REPAIR
Compressor contactor	Control circuit wiring	Check for R connection at	Run R connection to outdoor unit to power
does not energize		unit, and 24V between R-C	heat pump control
(cooling or heating)
	Compressor lock out	1. Check for 24V between	1. If no voltage between L-C turn thermostat
		L1-C on heat pump control	off and on again to reset high pressure
			switch.
		2. Check across high	2. If high pressure switch is open and will not
		pressure switch.	reset, replace high pressure switch.
	Compressor short cycle	Check for 24V between CC-C	If no voltage betwwen CC-C, jumper speed
	protection	and Y-C on heat pump control	up terminal and within 10 seconds power
			should appear between CC-C. Remove
			speed up jumper after 10 seconds.
	Heat pump control	Check all other possible	Replace heat pump control
	defective	causes. Manual 2100-065
	Contactor defective	Check for open or shorted coil	Replace contactor
		winding.
Fan outdoor motor	Motor defective	Check for open or shorted	Replace motor
does not run (cooling		motor winding
or heating except
	Motor capacitor defective	Check capacitor rating.	Replace capacitor
during defrost)
		Check for open or shorted
		capacitor.
	Heat pump control	Check across fan relay on	Replace heat pump control
	defective	heat pump control (Com-NC)
Reversing valve does	Reversing valve solenoid	Check for open or shorted coil	Replace solenoid coil
not energize	coil defective
(heating only)
	Heat pump control	Check for 24V between RV-C	1. Check control circuit wiring
	defective	and B-C	2. Replace heat pump control
Unit will not go into	Temperature sensor or	Disconnect termperature	1. If unit goes through defrost cycle, replace
defrost	heat pump control	sensor from board and jumper	temperature sensor
(heating only)	defective	across speed up terminals	2. If unit does not go through defrost cycle,
		and sen jump terminals. This	replace heat pump control
		should cause the unit to go
		through a defrost cycle within
		one minute.
Unit will not come out	Temperature sensor or	Jumper across speed up	1. If unit comes out of defrost cycle, replace
of defrost	heat pump control	terminals. This should cause	termperature sensor.
(heating only)	defective	the unit to come out of defrost	2. If unit does not come out of defrost cycle,
		within one minute.	replace heat pump control.

Manual 2100-373

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