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If pressure switch wires are damaged, this will affect
how the control board interacts with the switch. IF
wires are damaged, repair/replace (field supplied). IF
not damaged, replace main control PCB (HPXMCB50).
Attach low pressure manifold gauge. With the heat
running, verify the pressure is at least 3PSI. IF pressure
is below 3PSI, go to 4G. IF equal to or above 3PSI, go
back to step 4D.
Inspect Pressure Switch Wires
Step 4E
Step 4F
4. Error Code: E02 (cont.)
Verify Low Pressure Side
While the heat pump is running, the low side pressure should read at least 3PSI.
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