Troubleshooting; Solid State Hp Control - Bard I-TEC Series Installation Instructions Manual

SOLID STATE HEAT PUMP CONTROL
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.
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.
Symptom Description, Check & Possible Causes
1. Check for LED illumination.
Is there an LED illuminated on the board (flashing)?
2. Check for error codes.
Is the LED flashing a Code?
3. Check for power at board.
Is there 24 volts AC between R and C?
4. Check codes.
What code is blinking?
5. Compressor delay active.
Wait for 5 minute delay or jump board's "speed up pins".
6. Low pressure fault.
7A. High pressure fault.
Compressor will not
start (heating or
7B. Condensate overflow fault.
cooling)
8. Check for Compressor input signal.
Is there 24 volts AC between Y and C?
9. No power to board.
10. Check for Compressor output signal.
Is there 24 volts AC between CC & C?
11. No "Y" compressor input signal.
12. No "CC" compressor output signal.
13. Faulty board.
Fan outdoor motor
Heat pump control defective
does not run
(cooling or heating Motor defective
except during
Motor capacitor defective
defrost)
Reversing valve does
Heat pump control defective
not energize
(heating only)
Reversing valve solenoid coil defective
Unit will not go into
defrost Temperature sensor or heat pump control defective
(heating only)
Unit will not come
out of defrost Temperature sensor or heat pump control defective.
(heating only)
NOTE: If there was no power to 24 volt transformer,
CODES
Slow Blink
Fast Blink
1 Blink
2 Blink
3 Blink
4 Blink
TABLE 5 – Troubleshooting
Yes = go to Step #2; No = go to Step #3
Yes = go to Step #4; No = go to Step #8
Yes = go to Step #13; No = go to Step #9
Code "1", go to Step #6; Code "2", go to Steps #7A & #7B; Fast Blink,
go to Step #5
Check for proper operation; if still needed, go back to Step #1.
Check wiring circuit and unit pressures.
Check wiring circuit and unit pressures.
Check upper indoor coil drains; check lower outdoor coil drains; check
main drain line.
Yes = go to Step #10; No = go to Step #11
The unit either does not have unit voltage, the transformer is bad or the
unit wiring is incorrect.
Yes = go to Step #12; No = go to Step #13
Check thermostat wiring, incorrect phase of unit (see section on Phase
Monitor), and finally unit wiring.
Check compressor contactor for proper operation and finally check
compressor.
Replace defrost board.
Check across fan relay on heat pump control. (Com-NC) Replace heat
pump control.
Check for open or shorted motor winding. Replace motor.
Check capacitor rating. Check for open or shorted capacitor. Replace
capacitor.
Check for 24V between RV-C and B-C.
1. Check control circuit wiring.
2. Replace heat pump control
Check for open or shorted coil. Replace solenoid coil.
Disconnect temperature sensor from board and jumper across
"SPEEDUP" terminals and "SEN JMP" 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.
Jumper 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.

TROUBLESHOOTING

the compressor and outdoor fan motor will not
start for 5 minutes. This is because of the
compressor short cycle protection.
FUNCTION
Normal Operation
Compressor Time Delay
Low Pressure Switch Failure
High Pressure Switch Failure
or Condensate Overflow
Switch Activated
Defrost Mode Active
High Pressure or Overflow
Switch Lockout
What & How to Check / Repair
Manual 2100-578L
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