Heat Pump Water Heater
16
Safety Functions of the Controls
ECO (Energy Cut Off)
The ECO switch functions as a high limit switch responsive
when the water temperature approaches 170° F. If the water
temperature inside the tank reaches 170° F, the ECO switch
(normally closed) will open. The controller will disable all
heating functions and will render the heater into an error
condition.
Figure 5 – Energy Cut Off
Power Outages
The controls will automatically resume operations after power interruptions. Unit will return to
last operating mode set on user control.
Heat Pump and Compressor Operations
The electronic control has some safety measures to prevent damage to the refrigerant side of the
heat pump. It will prevent overheating and freeze up of the refrigerant part of the system.
Troubleshooting
Error Code LED Light
AN1 is red in color and is used to display diagnostic
codes. Flash rate is 0.33 seconds on, 0.33 seconds off
with 2.0 seconds off between flash codes. Flash codes
are as follows:
Figure 6 – Error Code LED
• Steady On – After 120 second anti short cycle period; No fault present
• Steady Off - No power to control or control board fault
• 1 Flash - Compressor off because Anti-short cycle Delay (normal operations)
• 2 Flashes - Compressor off because Ambient temperature too high (>=120
0
F)
• 3 Flashes - Compressor off because Discharge temperature fault (>= 195
0
F)
• 4 Flashes - Compressor off because Suction temperature fault (<= 37
0
F)
• 5 Flashes - (Discharge temp - Suction temp) (<35
0
F)
• 6 Flashes - Compressor off because High Pressure switch open; or water pump does not
work
• 7 Flashes - Compressor off because water temperature from heat exchanger is too
high(>= 132
0
F)
• 8 Flashes - One or more sensors (not tank temp related) open/short; or missing model
plug
• 9 Flashes – Open/short in the tank temperature sensing circuit
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