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T h e r m i s t o r s ( a m b i e n t , s u c t i o n , d i s c h a r g e , w a t e r o u t , e v a p o r a t o r ,
u p p e r t a n k a n d l o w e r t a n k )
There are seven (7) thermistors on the HPWH. Each one uses a standard 10,000 ohms resistor.
By measuring the resistance of the thermistor from the control board, you can determine if the
thermistor is working properly.
See chart for resistance values of the thermistors. They are all 10,000 ohm
based thermistors, so this chart will work for any of the thermistors on the
HPWH.
1. Turn the power off to the HPWH. You will expose yourself to a
potential shock when you reach for a thermistor.
2. Open the upper cover that surrounds the heat pump portion of the
water heater.
3. Locate the circuit board
4. Locate the specific thermistor you want to test.
5. Remove the thermistor from the circuit board.
6. Measure ohms resistance between the two wires of the thermistor.
7. Compare this resistance to the chart on the last page and determine
the temperature.
F a n A s s e m b l y
1. Cycle the water heater to Energy Saver or Normal mode. The fan does not work in
electric heat only mode.
2. You should hear the fan running.
3. Locate the fan motor Molex on the circuit
board.
4. Measure for 240 volts AC between the
black and blue wires.
5. If you have voltage, and the fan is not
running, replace the fan. If you do not have
voltage, replace the circuit board.
W a t e r P u m p
1. Cycle to water heater to Energy Saver or Normal mode. The water pump works in all
operating modes mode.
2. You may hear the pump running or feel the pump vibrate.
3. Locate the water pump Molex on the circuit board.
4. Measure for @160 – 240 volts AC between the black and blue wires.
5. If you have voltage, replace the water pump. If you do not have voltage, replace the
circuit board.
Figure 9 – Thermistor Connections
Figure 10– Fan Motor and Water Pump Connections
19
Heat Pump Water Heater
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Troubleshooting
