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The T5 ambient temperature provides the control with a
reading of room temperature as the evaporator fans draw air
through the machine housing.
The control checks the sensor to confirm:
1. Ambient temperature is between 45°F and 120°F
2. The T3a, T3b and T5 sensors are all within 15°F of each
other before the compressor starts.
The sensor is considered open if the voltage at the board is
greater than 4.88VDC and shorted if less than .098VDC.
If any of the above tests fail, the control will stop the sealed
system and operate the water heater in electric mode.
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