Grandaire Heat Pump Troubleshooting

Grandaire heat pumps usually function very well. Anyway, it’s better to be ready to deal with complicated situations. If you face one, use the manual given here. Find the problem which description is the same as you see as a fault in the functioning if your heat pump. Then read how to behave in such case and start the necessary actions on repair. The result won’t make you wait.

Grandaire 4860 Heat Pump Troubleshooting

Compressor and outdoor fan will not startPower failureCall power company
Fuse blown or circuit breaker trippedReplace fuse or reset circuit breaker
Defective contactor, transformer, control relay, or high - pressure, loss* of- charge or low- pressure switchReplace component
Insufficient line voltageDetermine cause and correct
Incorrect or faulty wiringCheck wiring diagram and rewire correctly
Thermostat setting too low/too highReset Thermostat setting
Compressor will not start but condenser fan runsFaulty wiring or circuitCheck wiring and repair or replace
Loose connections in compressor
Compressor motor burned out. seized, or internal overload openDetermine cause Replace compressor
Defective run capacitor, overload, or PTC (positive temperature coefficient) thermistorDetermine cause and replace
Low input voltageDetermine cause and correct
Compressor cycles (other than normally satisfying) cooling/heating callsRefrigerant overcharge or underchargeRecover refrigerant, evacuate system, and re- charge to capacities shown on rating plate
Defective compressorReplace and determine cause
Insufficient line voltageDetermine cause and correct
Blocked outdoor coilDetermine cause and correct
Defective run/start capacitor, overload or start relayDetermine cause and replace
Faulty outdoor fan motor or capacitorReplace
Restriction in refrigerant systemLocate restriction and remove
Compressor operates continuouslyDirty air filterReplace filter
Unit undersized for loadDecrease load or increase unit size
Thermostat temperature set too lowReset Thermostat setting
Low refrigerant chargeLocate leak, repair, and recharge
Air in systemRecover refrigerant, evacuate system, and re- charge
Outdoor coil dirty or restrictedClean coil or remove restriction
Excessive head pressureDirty air filterReplace filter
Dirty indoor or outdoor coilClean coil
Refrigerant overchargedRecover excess refrigerant
Air in systemRecover refrigerant, evacuate system, and re- charge
Indoor or outdoor air restricted or air short- cyclingDetermine cause and correct
Head pressure too lowLow refrigerant chargeCheck for leaks, repair and recharge
Restriction in liquid tubeRemove restriction
Excessive suction pressureHigh Heat loadCheck for source and eliminate
Reversing valve hung up or leaking internallyReplace valve
Refrigerant overchargedRecover excess refrigerant
Suction pressure too lowDirty air filterReplace fitter
Low refrigerant chargeCheck for leaks, repair and recharge
Metering device or low side restrictedRemove source of restriction
Insufficient coil airflowCheck filter replace if necessary
Temperature too low in conditioned areaReset Thermostat setting
Outdoor ambient below 55°F (13°C)Install low- ambient kit
Filter drier restrictedReplace

Grandaire R4H3 Series Heat Pump Troubleshooting

SymptomPossible Problem/Solution
The cleaning/circulating system is not operating correctly.Verify that skimmer baskets, pump basket and other screens are clean. Clean as necessary. If a filter is installed in the system, check the filter and clean as necessary.
Check valve positions. Adjust as necessary.
NOTE Multiple pieces of equipment operating at one time (for example, waterfalls, spa jets, and surface returns) may affect the cleaning system and prevent it from working properly.
Bubbles present in the pump basket.Air is in system. Check pool or spa water level to ensure it is at the proper level and air is not being drawn into suction piping. If water is at normal level, turn off pump. Turn the lid’s locking ring counter-clockwise until 'START aligns with ports. Remove lid and check for debris around lid seal seat or improper installation of lid seal, as either of these conditions will cause air leaks in the system. Clean lid seal and lid groove. Note that one (1) side of lid seal has two (2) ribs and the other has one (1). Place the side with two (2) ribs into lid groove. Replace lid on pump housing. Align ’START’ with ports and turn lid's locking ring clockwise until ’LOCKED’ aligns with ports. Hand-tighten the lid to make an air tight seal. Do not use any tools to tighten the lid. Turn the pump back on.
Air leaks are still present.Check the suction side piping union. While the pump is running, try to tighten the union. If this does not stop the air leak, turn off the pump. Loosen both unions and slide the pump out of the way. Remove, clean, and re-install both union o-rings.
Reposition the pump next to the piping and secure the union nuts to the pump. With clean union o-rings, hand-tightening of the unions should create a seal. If the unions still do not seal, gently tighten with a large pair of tongue-and-groove pliers.
Do not over-tighten.
There is no air in the system, but the pressure is still low.It is possible that debris is caught in the pump impeller. The pump impeller moves the water, and the vanes in the impeller can become blocked with debris.
1. Turn oft' the pump. Switch off the circuit breaker to the pump motor.
2. Remove the lid and basket.
3. Look inside the pump for any debris. Remove any debris found inside.
4. Replace the basket and lid.
5. Switch on the circuit breaker to the pump motor.
6. Turn on the pump, and see if the problem is solved.
7. If the impeller is still blocked with debris and it is not possible to remove the debris using Steps 2 through 4, the pump will need to be disassembled in order to access the inlet and outlet of the impeller.
There is no debris blocking the impeller and the pressure is still low.The pump impeller and diffuser are showing signs of normal wear. Have a qualified service technician check the impeller and diffuser and replace as necessary.
If the pump is part of a relatively new installation, it could be an electrical problem. Contact a qualified service technician. Have the technician check for loose electrical connections and check the voltage at the pump motor while it is in operation. The voltage must be within 10% of the motor's data plate rating. If the voltage is not within 10%, contact a qualified electrician and/or the local power service provider.
The pump is leaking water between the motor and pump body.This is caused by a damaged or failed mechanical seal. The pump seal is leaking air. Have a qualified service technician replace the seal.
The pump gets hot and shuts off periodically.Ensure that there is adequate room around the motor to circulate air and keep motor cool. Have a qualified electrician check for loose connections and check voltage at the pump motor while it is in operation. The voltage must be within 10% of the motor's data plate rating. If voltage is not within 10%, contact a qualified electrician and/or the local power service provider.