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Troubleshooting (continued)
DR90-AP Service Diagnostic Tree
Short Cycles (every couple of minutes)
JUMP "R" AND DEHU"
ON TERMINAL BLOCK
DOES THE
DEHUMIDIFIER
SHORT CYCLE NOW?
YES
DO THE FAN AND
COMPRESSOR
CYCLE TOGETHER
OR DOES THE FAN
STAY ON?
CYCLE
TOGETHER
36
NO
REMOVE BACK PANEL AND
CHECK VOLTAGE ON
FAN
COMPRESSOR RELAY
STAYS
(BLACK WIRES) DURING
ON
COMPRESSOR OFF CYCLE
CHECK VOLTAGE AT
DEFROST PROBE
DURING COMPRESSOR
OFF CYCLE
CHECK VOLTAGE AT
COMPRESSOR
OVERLOAD
IS 120V PRESENT
ON COMPRESSOR
NO
RELAY OUTPUT?
YES
IS 120V PRESENT
NO
ON DEFROST
PROBE?
YES
IS 120V PRESENT
NO
ON COMPRESSOR
OVERLOAD?
YES
TrueDry DR90-AP Dehumidification System 50077470-001
WAIT FOR SHORT
CYCLING TO REOCCUR
AND RETEST
REPLACE COMPRESSOR
RELAY AND RETEST
PERFORMANCE OF UNIT
REPLACE DEFROST
PROBE AND RETEST
PERFORMANCE OF UNIT
REPLACE COMPRESSOR
OVERLOAD AND RETEST
PERFORMANCE OF UNIT
REPLACE COMPRESSOR
REPLACE ONBOARD
DEHUMIDISTAT
M33761
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