Installation, Operation & Maintenance |
| HEV/H SERIES | Heat Controller, Inc. | ||||
|
|
|
|
|
|
|
|
|
| FUNCTIONAL TROUBLESHOOTING | |||||
|
|
|
|
|
|
| |
| Fault | Htg | Clg | Possible Cause | Solution |
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Check Line Voltage circuit breaker and disconnect |
|
| Main Power Problems | X | X | Green status LED off | Check for line voltage between L1 and L2 on the contactor |
| |
| Check for 24VAC between R and C on DXM |
| |||||
|
|
| |||||
|
|
|
|
|
|
| |
|
|
|
|
|
| Check primary/secondary voltage on transformer |
|
|
|
| X | Reduced or no water flow | Check pump operation or valve operation/setting |
| |
|
|
|
| in cooling | Check water flow adjust to proper flow rate |
| |
|
|
|
|
|
|
|
|
|
|
| X | Water t emperature out of range in | Bring water temp within design parameters |
| |
|
|
|
|
| |||
|
|
|
| cooling |
|
| |
|
|
|
|
|
| Check for dirty air filter and clean or replace |
|
| HP Fault Code 2 | X |
| Reduced or no air flow | Check fan motor operation and airflow restrictions |
| |
| High Pressure |
| in heating | Dirty air coil- construction dust etc. |
| ||
|
|
|
| ||||
|
|
|
|
|
| Too high of external static. Check static vs blower table |
|
|
| X |
| Air t emperature out of range in | Bring return air temp within design parameters |
| |
|
|
| heating |
| |||
|
|
|
|
|
| ||
|
|
|
|
|
|
|
|
|
| X | X | Overcharged with refrigerant | Check superheat/subcooling vs typical operating condition |
| |
|
| table |
| ||||
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
| X | X | Bad HP switch | Check switch continuity and operation - Replace |
| |
|
|
|
|
|
|
| |
|
| X |
| Frozen water heat exchanger | Thaw heat exchanger |
| |
|
| X | X | Bad HPWS Switch | Replace HPWS Switch |
| |
|
|
|
|
|
|
| |
| LP/LOC | X | X | Insufficient charge |
| Check for refrigerant leaks |
|
|
|
| Compressor pump down at start- | Check charge and |
| ||
| Low Pressure/Loss of Charge | X |
|
| |||
|
| up |
| ||||
|
|
|
|
|
| ||
|
|
|
|
|
|
|
|
|
|
|
| Reduced or no water flow | Check pump operation or water valve operation/setting |
| |
|
| X |
| Plugged strainer or filter - clean or replace |
| ||
|
|
| in heating |
| |||
| LT1 Fault - Code 4 |
|
| Check water flow adjust to proper flow rate |
| ||
|
|
|
|
|
| ||
|
|
|
|
|
|
| |
| Water Low Temperature | X |
| Inadequate | Check antifreeze density with hydrometer |
| |
|
|
|
|
|
|
| |
|
| X |
| Improper low temperature setting | Clip LT1 jumper for antifreeze (10°F) use |
| |
|
|
|
| (30°F vs 10°F) |
|
|
|
|
| X |
| Water t emperature out of range |
| Bring water temp within design parameters |
|
|
| X | X | Bad thermistor | Check temp and impedance correlation per chart |
| |
|
|
|
| Reduced or no air flow | Check for dirty air filter and clean or replace |
| |
|
|
| X | Check fan motor operation and airflow restrictions |
| ||
|
|
| in cooling |
| |||
|
|
|
| Too high of external static - check static vs blower table |
| ||
|
|
|
|
|
|
| |
| LT2 Fault - Code 5 |
| X | Air temperature out of range | Too much cold vent air - bring entering air temp within |
| |
|
| design parameters |
| ||||
| Low Air Temperature |
|
|
|
|
| |
|
|
|
|
|
|
| |
|
|
| X | Improper low temperature setting | Normal airside applications will require 30°F only |
| |
|
|
|
| (30°F vs 10°F) |
|
|
|
|
| X | X | Bad thermistor | Check temp and impedance correlation per chart |
| |
|
| X | X | Blocked drain | Check for blockage and clean drain |
| |
|
| X | X | Improper trap |
| Check trap dimensions and location ahead of vent |
|
|
|
|
|
|
| Check for piping slope away from unit |
|
| Condensate |
| X | Poor drainage | Check slope of unit toward outlet |
| |
|
|
|
|
| Poor venting - check vent location |
| |
| High Condensate Level |
| X | Moisture on sensor |
| Check for moisture shorting to air coil |
|
|
| X | X | Plugged air filter | Replace air filter |
| |
|
| X | X | Restricted return air flow | Find and eliminate rectriction - increase return duct |
| |
|
| and/or grille size |
| ||||
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Check power supply and 24VAC voltage before and during |
|
|
|
|
|
|
| operation |
|
|
| X | X | Under voltage | Check power supply wire size |
| |
| Over/Under | Check compressor starting. Need hard start kit? |
| ||||
|
|
|
|
|
| ||
|
|
|
|
| Check 24VAC and unit transformer tap for correct power |
| |
| (Auto Resetting) |
|
|
|
|
| |
|
|
|
|
| supply voltage |
| |
|
|
|
|
|
|
| |
|
|
|
|
|
| Check power supply voltage and 24VAC before and during |
|
|
| X | X | Over voltage | operation. |
| |
|
| Check 24VAC and unit transformer tap for correct power |
| ||||
|
|
|
|
|
|
| |
|
|
|
|
|
| supply voltage |
|
|
|
|
|
|
|
| |
| Unit Performance | X |
| Heating Mode LT2>125°F | Check for poor air flow or overcharged unit |
| |
|
|
|
|
|
|
| |
|
| X | Cooling Mode LT1>125°F OR | Check for poor water flow, or air flow |
| ||
|
|
| LT2< 40°F |
| |||
|
|
|
|
|
| ||
|
|
|
|
|
|
|
|
| Swapped Thermistor | X | X | LT1 and LT2 swapped | Reverse position of thermistors |
| |
| Code 9 |
| |||||
|
|
|
|
|
|
| |
|
|
|
|
|
|
| |
|
| X | X | Blower does not operate | Check blower line voltage |
| |
|
|
|
|
|
| Check blower low voltage wiring |
|
|
|
|
|
|
|
| |
| ECM Fault - Code 10 |
|
| Blower operating with incorrect | Wrong unit size selection |
| |
|
|
|
| airflow |
|
| |
|
|
|
| Wrong unit family selection |
| ||
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Wrong motor size |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Incorrect blower selection |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| C |
|
42