Hayward HP50A - Troubleshooting Error Code: E01

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Attach gauge
manifold to
high side
Replace switch:
HPX2001-3605
3. Error Code: E01
Does error clear
when heat pump
is not running?
Power down
Heat Pump
Inspect
pressure switch
wires
NO
YES
Error Code:
E01
Remove pressure
switch wires & test
switch for resistance
Does the
switch have
resistance?
YES
NO
Repair/replace
Field Supplied
Are wires
damaged?
Replace Main PCB:
HPXMCB50
YES
NO
During
operation, does
pressure exceed
580PSI?
Verify pump
speed, increase
if necessary
YES
NO
Is low pressure
side dropping
rapidly?
YES
Replace filter
dryer:
(field supplied)
NO
NO
Remove refrigerant,
evacuate to 500 microns,
recharge with 3.1lbs
R-410A
Replace switch:
HPX2001-3605