Bard WH-301, WH361 Solid State Heat Pump Control Troubleshooting Procedure

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 7

TROUBLESHOOTING

SYMPTOM	POSSIBLE CAUSES		WHAT TO CHECK		HOW TO CHECK OR REPAIR
Compressor contactor	Control circuit wiring	Check for R connection at unit,		Run R connection to outdoor unit to power
does not energize		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
		2.	Check across high		switch.
				2. If high pressure switch is open and will not
			pressure switch.		reset, replace high pressre switch.
	Compressor short	Check for 24V between CC-C		If no voltage between CC-C, jumper speed up
	cycle protection	and Y-C on heat pump control		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
	Power phasing not	Check for red LED on phase		Switch two power leads to the unit.
	correct.	monitor. (3 phase units only.)
Fan outdoor motor	Motor defective	Check for open or shorted		Replace motor
does not run		motor winding
(cooling or heating
	Motor capacitor	Check capacitor rating. Check		Replace capacitor
except during defrost)
	defective	for open or shorted capacitor.
	Heat pump control	Check across fan relay on heat		Replace heat pump control
	defective	pump control (Com-NC)
Reversing valve does	Reversing valve	Check for open or shorted coil		Replace solenoid coil
not energize	solenoid 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	Disconnect temperature sensor		1. If unit goes through defrost cycle, replace
defrost	or heat pump control	from board and jumper across			temperature sensor
(heating only)	defective	speed up terminals and sen
		jump terminals. This should		2. If unit does not go through defrost cycle,
		cause the unit to go through a			replace heat pump control.
		defrost cycle within one minute.
Unit will not come out	Temperature sensor	Jumper across speed up		1. If unit comes out of defrost cycle, replace
of defrost	or 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	2100-193O
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