Owners Manual - AquaCal

Page 32
5.2 Fault Code Definitions
“dPO” Indicator
FAULT CODE RULE OUT RESOLUTION
Defrost sensor is open.
“PO” Indicator
Water temperature sensor is open.
“dPC” Indicator
Defrost sensor is shorted.
“PC” Indicator
Water temperature sensor is
shorted.
“HP” Indicator
Refrigerant system’s high-pressure
switch is open.
“HP5” Indicator
Five high-pressure faults have
occurred and heat pump has
locked to prevent damage.
Cut or loose
sensor wiring
Cut or loose
sensor wiring
Short circuit in
the defrost
sensor wiring or
defective sensor
Short circuit in
water sensor
wiring or
defective sensor
Low water flow –
(pool-side in
heating mode)
Or
(source-side in
cooling mode)
Water pump off
or insufficient
flow
Valves in
incorrect position
Water Pressure
Switch
incorrectly
calibrated
Defective highpressure
switch
or wiring
Defrost sensor requires replacement.
Water temperature sensor requires replacement.
Defrost sensor requires replacement.
Water temperature sensor requires replacement.
STEP 1:
Confirm water pump on. If multispeed pump(s), run at
high speed to determine if error persists. If error
recurs, proceed to next step.
STEP 2:
Confirm water is not being diverted away from heat
pump or insufficient water balance exists. See
“Operating Pressures and Water Flow Rates” on page
19 for more information on flow rates. If error recurs,
proceed to next step.
STEP 3:
See section entitled “Water Flow (Pressure) Switch
Adjustment” on page 20.
STEP 4:
Replace high-pressure switch. If error recurs, proceed
to next step.
STEP 5:
Call heat pump installer or AquaCal AutoPilot
Customer Support for further assistance.
STEP 1:
Reset heat pump by turning power off and back on to
clear error. See resolution for “HP” Indicator. If
problem persists, contact AquaCal AutoPilot Customer
Support for further assistance.