Troubleshooting; Table 5A Troubleshooting; Table 5B Dehumidification Relay Logic Board - Bard Q24A2DA Installation Instructions Manual

Sympton
Control circuit wiring
Compressor lock out
Compressor contactor
does not energize
(cooling or heating)
Compressor short cycle
protection
Contactor defective
Motor defective
Outdoor fan motor
does not run
Motor capacitor defective
(cooling or heating
except during defrost)
Cooling Mode Unoccupied
Cooling Mode Occupied
Cooling Mode w/Dehum.
Heating Mode Unoccupied
Heating Mode Occupied
Heating Mode w/Dehum.
Dehumidification Unoccupied
Dehumidification Occupied

TROUBLESHOOTING

Possible Cause
Check for R connection at unit,
and 24V between R-C.
1. Check for 24V between
L1-C on heat pump control.
2. Check across high pressure
switch.
Check for 24V between CC-C
and Y-C on heat pump control.
Check for open or shorted coil
winding.
Check for open or shorted motor
winding.
Check capacitor rating. Check
for open or shorted capacitor.
DEHUMIDIFICATION RELAY LOGIC BOARD
Inputs to Board
G Y B W2 E1
X X
X X
X X
X X
X X
X X
TROUBLESHOOTING
TABLE 5A
What to Check
Run R connection to outdoor units
1.
2.
If no voltage between CC-C jumper speed
up terminal and within 10 seconds power
should appear between CC-C. Remove
speed up jumper after 10 seconds.
Replace contactor.
Replace motor.
Replace capacitor.
TABLE 5B
A1 D RAT L G1
X
X X
X X
X
X X
X X
X X
X X X
How to Check or Repair
If no voltage between L1-C turn ther-
mostat off and on again to reset high
pressure switch.
If high pressure switch is open and will
not reset, replace high pressure switch.
Outputs From Board
BK YO RV W E1 A2 TWV
X X
X X
X X
X
X
X
X
X
Manual
Page
L
X
X
X
X X
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