Heat Controller, Inc. HTV/HTD/HTH SERIES
46
FUNCTIONAL TROUBLESHOOTING
Fault Htg Clg Possible Cause Solution
X X Blocked Drain Check for blockage and clean drain
X X Improper Trap Check trap dimensions and location
X Check for piping slope away from unit
Poor Drainage
Poor venting. Check vent location
Condensate Fault -
Code 6
X Moisture on Sensor Check for moisture shorting to air coil
Check power supply and 24VAC voltage before
operation
Check power supply wire size
Over/Under Voltage -
Code 7
(Auto Resetting)
X X Under Voltage
Check compressor starting. Need hard start kit
Check 24 VAC and unit transformer tap for correct
supply voltage
Check power supply voltage and 24 VAC before
operation
X X
Check 24 VAC and unit transformer tap for correct
supply voltage
X Heating Mode FP2>125°F Check for poor air flow or overcharged unit Unit Performance
Sentinel - Code 8
X Cooling Mode FP1>125°F or FP2<40°F Check for poor water flow, or air flow
X X No Compressor Operation See “only fan operates”
X X Compressor Overload Check and replace if necessary
No Fault Code Shown
X X Control Board Reset power and check operation
X X Dirty Air Filter Check and clean air filter
X X Unit in “Test Mode” Reset power or wait 20 minutes for auto exit
X X Unit Selection Unit may be oversized for space. Check sizing load
of space
Unit Short Cycles
X X Compressor Overload Check and replace if necessary
X X Thermostat Position Insure thermostat set for heating or cooling
X X Unit Locked Out Check for lockout codes. Reset power
X X Compressor Overload Check compressor overload. Replace if necessary
Only Fan Runs
X X Thermostat Wiring Check thermostat wiring at heat pump. Jumper for
compressor operation in test mode
X X Thermostat Wiring Check G wiring at heat pump. Jumper G and R
operation
Jumper G and R for fan operation. Check for across
BR contacts
X X Fan Motor Relay
Check fan power enable relay operation (if possible)
X X Fan Motor Check for line voltage at motor. Check capacity
Only Compressor Runs
X X Thermostat Wiring Check thermostat wiring at heat pump. Jumper
compressor operation in test mode.
Functional Troubleshooting
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