Bard T24H1 Installation Instructions Manual

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Bard T24H1 Installation Instructions Manual Manual pdf 20 page image

Manual 2100-541DPage 20 of 28TROUBLESHOOTINGTABLE 3TROUBLESHOOTINGSympton Description, Check & Possible Causes What & How to Check / RepairCompressorwill not start(heating orcooling)1. Check for LED illumination.Is there an LED illuminated on the board (flashing)? Yes = go to Step #2; No = go to Step #32. Check for error codes.Is the LED flashing a Code? Yes = go to Step #4; No = go to Step #83. Check for power at board.Is there 24 volts AC between R and C? Yes = go to Step #13; No = go to Step #94. Check codes.What code is blinking? Code "1", go to Step #6; Code "2", go to Step#7; Fast Blink, go to Step #55. Compressor delay active.Wait for 5 minute delay or jump board's "speed up pins". Check for proper operation; if still needed, go back to Step #1.6. 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.Is there 24 volts AC between Y and C? Yes = go to Step #10; No = go to Step #119. 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.Is there 24 volts AC between CC & C? Yes = go to Step #12; No = go to Step #1311. 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 outdoormotor doesnot run(cooling orheating exceptduring defrost)Heat pump control defective Check across fan relay on heat pump control. (Com-NC)Replace heat pump control.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.Reversingvalve does notenergize(heating only)Heat pump control defectiveCheck for 24V between RV-C and B-C.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 gointo defrost(heating only)Temperature sensor or heat pump control defectiveDisconnect temperature sensor from board and jumper across "SPEEDUP" terminals and "SENJMP" terminals. This should cause the unit to go through a defrost cycle within 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 notcome out ofdefrost(heating only)Temperature sensor or heat pump control defectiveJumper across "SPEEDUP" terminal.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.SOLID STATE HEAT PUMP CONTROLTROUBLESHOOTING PROCEDURE1. NOTE: A thorough understanding of the defrostcycle sequence is essential. Review that sectionearlier in this manual prior to troubleshooting thecontrol. Turn on AC power supply to unit.2. Turn thermostat blower switch to “fan on” – theindoor blower should start. (If it doesn’t,troubleshoot indoor unit and correct problem.)3. Turn thermostat blower to “auto” position. Indoorblower should stop. NOTE: Many models have a1-minute blower time delay on “off” command;wait for this to time-out.4. Set system switch to “heat” or “cool”. Adjustthermostat to call for heat or cool. The indoorblower, compressor and outdoor fan should start.NOTE: If there was no power to 24 volt transformer,the compressor and outdoor fan motor willnot start for 5 minutes. This is because ofthe compressor short cycle protection.LED BLINK CODESBLINK FUNCTIONSlow Normal function (1.0 sec on/1.0 sec off)Fast Compressor Delay timer active (0.1 sec on/0.1 sec off)1 Low pressure switch failure2 High pressure switch failure/“Soft” Lockout3 Defrost mode active4 High pressure switch failure/“Hard” Lockout