Operation
26
Troubleshooting
Table 7 Troubleshooting Service Guide
Selector switch is in “ON” position & pump will not start.
1. Open disconnect switch
2. Tripped overloads
3. Phase monitor fault
4. Low tank level
Pump is rotating but no pressure is established.
1. Improper rotation
2. No water in reservoir
3. Valves not open
4. No back pressure
5. Pump suction blocked
6. Pump seal leaking
Pump runs properly, but compressor does not start.
1. Compressor is not getting energized
2. Flow switch not activated
Compressor hums but will not start.
1. Low line voltage
2. Motor windings shorted to ground
3. Internal compressor damage
4. Improperly wired
Compressor will not start (no hum).
1. Open disconnect
2. Thermal overload open
3. Relay not closing to start compressor
4. Bad motor windings
5. Loss of refrigerant charge
Compressor starts but trips on internal protector
1. High suction or discharge pressure
2. Low line voltage
3. Bad motor windings
1. Low refrigerant charge
2. Defective expansion valve
High refrigerant pressure fault
1. Dirty air filters
2. Refrigerant overcharge
3. Dirty condenser
4. Malfunction of fan motor
5. Excessive ambient air temperature
Low refrigerant pressure fault
1. Extreme low ambient temperature
2. Refrigerant leak
3. Lack of fluid flow through heat exchanger
4. Liquid line solenoid valve stuck or not opening
5. Expansion valve stuck or lost bulbwell charge.
1. Pump not running
2. System not filled
3. Air in the system
4. Flow switch paddle stuck
1. Overload setting incorrect
2. Bad motor windings
3. Low pump pressure due to low piping resistance
1. Incorrect line phasing
2. Low/High incoming voltage
3. Voltage imbalance between phases
1. Low/no fluid in Heat Exchanger reservoir
2. Float switch stuck in the open position
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