Hayward HP50A - Troubleshooting Error Code: E02

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Attach gauge
manifold to
low side
4. Error Code: E02
Does error clear
when heat pump
is not running?
YES
NO
Error Code:
E02
Repair/replace
wiring:
Field Supplied
Replace Main
PCB:
HPXMCB50
While dormant,
is pressure
above 25PSI?
System is low on
refrigerant.
Find leak. Recover any
remaining refrigerant.
NO
Repair leaks, evacuate
to 500 microns &
recharge with 3.1lbs R-
410A
YES
Attach gauge
manifold to
low side
Remove pressure
switch wires & test
switch for resistance
Does the
switch have
resistance?
YES
Replace switch:
HPX20000-3603
NO
Inspect
pressure switch
wires
Are wires
damaged?
YES
NO
During
operation, is
pressure above
3PSI?
YES
Leak test,
recover any
remaining
refrigerant
Repair leaks,
evacuate to 500
microns &
recharge with
3.1lbs R-410A
Is fan
running?
NO
YES
NO
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