Aquacal LTM0266 - Manual (Page 38)

Page 32
5.2 Fault Code Definitions
FAULT CODE RULE OUT RESOLUTION
“dPO” Indicator
Defrost sensor is open. Cut or loose
sensor wiring
Defrost sensor requires replacement.
“PO” Indicator
Water temperature sensor is open. Cut or loose
sensor wiring
Water temperature sensor requires replacement.
“dPC” Indicator
Defrost sensor is shorted. Short circuit in
the defrost
sensor wiring or
defective sensor
Defrost sensor requires replacement.
“PC” Indicator
Water temperature sensor is
shorted. Short circuit in
water sensor
wiring or
defective sensor
Water temperature sensor requires replacement.
“HP” Indicator
Refrigerant system’s high-pressure
switch is open. Low water flow –
(pool-side in
heating mode)
Or
(source-side in
cooling mode)
Water pump off
or insufficient
flow
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.
Valves in
incorrect position
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.
Water Pressure
Switch
incorrectly
calibrated
STEP 3:
See section entitled “Water Flow (Pressure) Switch
Adjustment
” on page 20.
Defective high-
pressure switch
or wiring 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.
“HP5” Indicator
Five high-pressure faults have
occurred and heat pump has
locked to prevent damage. 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.