Heat Pump Water Heater
20
Circuit Board
The circuit board may become damaged. IF the board has
power, then the board must work. In the event nothing happens
when you attempt to turn on the HPWH, then check in
sequence:
• Circuit breaker
• Local ON/OFF switch
• User Key Pad for Normal or Energy Saver Mode (you
will see a green led light)
Measure for 240 VAC at the L1B (black wire) and the L2B (red wire) on the control board. If
you have the voltage present, then replace the circuit board. If you do not have voltage present,
then the problem lies in the power supplied to the HPWH.
IF the board has power, the AN1 LED will be steady on
after two minutes; or blinking during the anti-short cycle
phase.
Figure 11– Power Check
Relay Switch
There are three relay switches on the HPWH. The
purpose of the relay switch is to send power and control
certain component parts. With the control board, they
control the compressor, upper heating element and
lower heating element. The control board sends out the
240 volt signal thru the respective wires from the P7
connection: black for compressor; orange for upper
heating element; blue for lower heating element.
Figure 12 - Relays
The control board knows when to send a signal based on
1. the mode selection (energy saver, normal or electric elements) and
2. the temperature sensing of the upper and lower tank thermistors
The control sends the 240 volt signal to the relay. The relay receives the signal and activates the
electromagnet (contactor). This closes the copper contacts at the Normal Open terminal
connection of the relay and completes the 240 volt circuit. The completed 240 volt circuit
energizes the upper element, lower element or compressor – depending on the mode selection.
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