Bard CH4S1, CH5S1, CH3S1 Solid State Heat Pump Control Troubleshooting Procedure

Page 21

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 4

TROUBLESHOOTING

Symptom

Description, Check & Possible Causes

What & How to Check / Repair

 

 

 

 

Compressor will not start

1.

Check for LED illumination.

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

(heating or cooling)

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

 

 

 

 

 

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 does

Heat pump control defective

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

not run (cooling or heating

Replace heat pump control.

 

 

except during defrost)

 

 

 

Motor defective

Check for open or shorted motor winding. Replace motor.

 

 

 

 

 

Motor capacitor defective

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

 

 

 

 

Reversing valve does not

 

 

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

energize (heating only)

Heat pump control defective

1. Check control circuit wiring.

 

 

 

2. Replace heat pump control.

 

 

 

 

 

Reversing valve solenoid coil defective

Check for open or shorted coil.

 

Replace solenoid coil.

 

 

 

 

 

 

 

Unit will not go into defrost

 

 

Disconnect temperature sensor from board and jumper across “SPEEDUP” terminals

(heating only)

 

 

and “SEN JMP” terminals. This should cause the unit to go through a defrost cycle within

 

Temperature sensor or heat pump control defective

one minute.

 

 

 

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 out of

 

 

Jumper across “SPEEDUP” terminal.

defrost (heating only)

Temperature sensor or heat pump control defective

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

 

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 2100-455M

Page

21 of 28

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Contents Models CH3S1 CH4S1 CH5S1Contents For more information, contact these publishers Getting Other Information and PublicationsCH 4S 1 a Heat Pump Wall Mount Model NomenclatureX X X Electric Heat TableUnit Dimensions CH3S1 Unit DimensionsCH4S1 and CH5S1 Unit Dimensions Single Circuit Dual Circuit Electrical SpecificationsGeneral Shipping DamageDuct Work FiltersMounting the Unit OPTiOnal top outlet flangeCH3S1 Wall Mounting Instructions CH4S1 and CH5S1 Wall Mounting Instructions Electric Heat Clearance Optional Clearance RecommendedReturn Opening Wall Mounting InstructionsCommon Wall Mounting Installations False Wall InstallationWiring Main Power Thermostat Wire SizeTAP Range Application Low voltage connectionsImportant Installer Note Pressure Service PortsStart UP cont’d Service Hints Phase MonitorSequence of Operation COmpressor current & pressure control moduleDefrost Control Board Defrost CycleManual 2100-455M Troubleshooting Solid State Heat Pump Control Troubleshooting ProcedureTemperature F VS Resistance R of Temperature Checking Temperature Sensor Outside Unit CircuitCompressor SOlenoid FAN Blade Setting DimensionsRemoval of FAN Shroud Refrigerant CHARGeMaximum ESP of Operation Indoor Blower PerformancePressure Table TemperaturePressure Table Symptom Cause/Procedure Troubleshooting GE ECM MotorsReplacing ECM Control Module Troubleshooting GE ECM Motors Contd
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