Honeywell TRUEDRY DH150 - Page 15

TrueDRY DH150
13 69-2271EFS—01
Problem Recommended Troublshooting Steps
Impellerfandoesnotrunwithfan
switchineitherposition.Impeller
fan does not run with ventilation
timer activated. Compressor runs
brieflybutcycleson&offwith
humiditycontrolturnedtoON.
1. Looseconnectioninimpellerfancircuit.
2. Obstructionpreventsimpellerfanrotation.
3. Defectiveimpellerfan.
4. Defectiveimpellerfanrelay.
5. Defectiveimpellerfancapacitor.
Impellerfanrunswithfanswitch
ON.Impellerfandoesnotrunwith
ventilation timer activated.
1. Defectiveventilationtimer.
2. Timenotcorrectonventilationtimer.
3. Ventilationtimersettomanual&switchedOFF.
4. Defectivefanswitch.
Evaporatorcoilfrostedcontinu-
ously,lowdehumidifyingcapacity.
1. Defrostthermostatlooseordefective.
2. Low refrigerant charge.
3. Dirtyairfilter(s)orairflowrestricted.
4. Excessivelyrestrictiveductingconnectedtounit.
Unitnotprovidingventilation.
Ventilationtimernotoperating
correctly.
1. Iftimerisnotfunctioningcorrectlyresettimerandreprogram.
2. Checkcontrolwireconnections(checkconnectionsatfreshairdamper
also).
3. Defectivefreshairdamper.
4. Defectivefanswitch.
Unitremovessomewater,butnot
asmuchasexpected.
1. Airtemperatureand/orhumidityhavedropped.
2. Humiditymeterandorthermometerusedareoutofcalibration.
3. Unithasentereddefrostcycle.
4. Airfilterdirty.
5. Defectivedefrostthermostat.
6. Low refrigerant charge.
7. Airleaksuchasloosecoverorductingleaks.
8. Defectivecompressor.
9. Restrictiveducting.
10.OptionalCondensatePumpSafetySwitchopen.
Troubleshooting