Bard W42H1, W24H1D, W18H1, W48H1, W60H1D Solid State Heat Pump Control Troubleshooting Procedure

Page 19

TROUBLESHOOTING

SOLID STATE HEAT PUMP CONTROL TROUBLESHOOTING PROCEDURE

1.NOTE: A thorough understanding of the defrost cycle sequence is essential. Review that section earlier in this manual prior to troubleshooting the control. Turn on AC power supply to unit.

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 to “auto” position. Indoor blower should stop. NOTE: Many models have a 1-minute blower time delay on “off” command; wait for this to time-out.

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.

 

LED BLINK CODES

BLINK

FUNCTION

Slow

Normal function (1.0 sec on/1.0 sec off)

Fast

ASCD timer active (0.1 sec on/0.1 sec off)

1Low pressure switch failure

2High pressure switch failure/“Soft” Lockout

3Defrost mode active

4High pressure switch failure/“Hard” Lockout

TABLE 1

TROUBLESHOOTING

 

Symptom

 

Description, Check & Possible Causes

What & How to Check / Repair

 

 

 

 

 

Compressor will

1. Check for LED illumination.

Yes = go to Step #2; No = go to Step #3

not start (heating

Is there an LED illuminated on the board (flashing)?

 

 

or cooling)

 

 

 

 

2. Check for error codes.

Yes = go to Step #4; No = go to Step #8

 

 

 

 

Is the LED flashing a Code?

 

 

 

 

 

 

 

 

 

 

 

3. Check for power at board.

Yes = go to Step #13; No = go to Step #9

 

 

Is there 24 volts AC between R and C?

 

 

 

 

 

 

 

 

 

 

 

4. Check codes.

Code "1", go to Step #6; Code "2", go to Step#7; Fast Blink, go to Step #5

 

 

What code is blinking?

 

 

 

 

 

 

 

 

 

 

 

 

5.

Compressor delay active.

Check for proper operation; if still needed, go back to Step #1.

 

 

Wait for 5 minute delay or jump board's "speed up pins".

 

 

 

 

 

 

 

 

6.

Low pressure fault.

Check wiring circuit and unit pressures.

 

 

 

 

 

 

 

 

7.

High pressure fault.

Check wiring circuit and unit pressures.

 

 

 

 

 

 

 

8. Check for Compressor input signal.

Yes = go to Step #10; No = go to Step #11

 

 

Is there 24 volts AC between Y and C?

 

 

 

 

 

 

 

 

 

 

 

9. No power to board.

The unit either does not have unit voltage, the transformer is bad or the unit wiring is incorrect.

 

 

 

 

 

 

 

10. Check for Compressor output signal.

Yes = go to Step #12; No = go to Step #13

 

 

Is there 24 volts AC between CC & C?

 

 

 

 

 

 

 

 

 

 

 

11. No "Y" compressor input signal.

Check thermostat wiring, incorrect phase of unit (see section on Phase Monitor), and finally

 

 

 

 

unit wiring.

 

 

 

 

 

 

 

12. No "CC" compressor output signal.

Check compressor contactor for proper operation and finally check compressor.

 

 

 

 

 

 

 

 

13.

Faulty board.

Replace defrost board.

 

 

 

 

 

Fan outdoor motor

Heat pump control defective

Check across fan relay on heat pump control. (Com-NC)

does not run

 

 

Replace heat pump control.

(cooling or heating

 

 

 

Motor defective

Check for open or shorted motor winding. Replace motor.

except during

 

 

 

 

Motor capacitor defective

Check capacitor rating. Check for open or shorted capacitor. Replace capacitor.

defrost)

 

 

 

 

 

 

Reversing valve

 

 

Check for 24V between RV-C and B-C.

does not energize

Heat pump control defective

1. Check control circuit wiring.

(heating only)

 

 

2. Replace heat pump control

 

 

 

 

 

 

 

 

Reversing valve solenoid coil defective

Check for open or shorted coil.

 

 

Replace solenoid coil.

 

 

 

 

 

 

 

 

 

 

Unit will not go

 

 

Disconnect temperature sensor from board and jumper across "SPEEDUP" terminals and "SEN

into defrost

Temperature sensor or heat pump control defective

JMP" terminals. This should cause the unit to go through a defrost cycle within one minute.

(heating only)

1. If unit goes through defrost cycle, replace temperature sensor.

 

 

 

 

 

 

2. If unit does not go through defrost cycle, replace heat pump control.

 

 

 

 

 

 

Unit will not come

 

 

Jumper across "SPEEDUP" terminal.

out of defrost

Temperature sensor or heat pump control defective

This should cause the unit to come out of defrost within one minute.

(heating only)

1. If unit comes out of defrost cycle, replace temperature sensor.

 

 

 

 

 

 

2. If unit does not come out of defrost cycle, replace heat pump control.

 

 

 

 

 

 

 

 

 

 

 

 

Manual

2100-511F

Page

19 of 27

Image 19
Contents Bard Manufacturing Company, Inc Contents For More INFORMATION, Contact These Publishers Getting Other Information and PublicationsGeneral Shipping DamageHeat Pump Wall Mount Model Nomenclature Condensate Drain Duct WorkFilters Fresh AIR IntakeMounting the Unit Wall Mounting InformationSupply Return Right UnitMounting Instructions W30H1, W36H1 W42H1, W48H1, W60H1 W30H1, W36H1, W42H1, W48H1, W60H1 Electric Heat ClearanceWall Mounting Instructions Common Wall Mounting Installations Wiring LOW Voltage Wiring Wiring Main PowerTAP Range Topping OFF System Charge Safety PracticesPhase Monitor Important Installer NoteHigh & LOW Pressure Switch Three Phase Scroll Compressor Start UP InformationSequence of Operation Pressure Service PortsDefrost Cycle Defrost Control Board Troubleshooting Solid State Heat Pump Control Troubleshooting ProcedureTemperature F VS. Resistance R of Temperature Sensor Checking Temperature Sensor Outside Unit CircuitRemoval of FAN Shroud FAN Blade Setting DimensionsFAN Blade Setting FAN Blade DimensionCooling Pressure Table Heating Pressures ALL Temperatures FElectrical Specifications W**H Series Indoor Blower Performance Recommended AirflowElectric Heat Tables Maximum ESP of Operation Electric Heat onlyHeater Kits Circuit Breaker Wmcb & Pull Disconnect Wmpd Optional AccessoriesW18, W24 W30, W36 W42, W48, W60 Vent & Control Options
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W60H1, W18H1, W48H1, W42H1D, W30H1 specifications

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