Symptom
Cause
Remedy
Pump is overloaded
Improper power to pump outlet
Consult electrician to determine
cause.
Pump rotor is not freely rotating.
1. Unplug pump and shut off water
supply.
2. Open faucets/taps and drain
water from the piping.
3. Loosen the screw ring to
separate motor from the pump
housing.
4. Verify that the pump rotor is
seated properly and there is no
debris.
5. Rotate the pump rotor counter-
clockwise for three or four
revolutions to make sure it can
freely spin.
Blocked rotor inside pump
Foreign matter in the rotor cavity
1. Unplug pump and shut off water
supply.
2. Open faucets/taps and drain
water from the piping.
3. Loosen the screw ring to
separate motor from the pump
housing and check for foreign
matter.
Low input voltage to pump
Improper power to pump outlet
Consult electrician to determine
cause.
WARNING:
Extreme temperature hazard. Water temperature above 125°F (51°C) can cause severe
burns or scalding instantly.
Troubleshooting
20
Laing Thermotech ACT-4 wireless Potable Hot Water Recirculation Kit Installation, Operation and Maintenance
Manual