Aquacal LTM0266 - Manual (Page 39)

Page 33
FAULT CODE RULE OUT RESOLUTION
“LP” Indicator
Refrigerant system’s low-pressure
switch is open.
Water pump off
or insufficient
speed
STEP 1:
Confirm water pump on. 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 low-
pressure switch
or wiring STEP 4:
Replace low-pressure switch. If error recurs, proceed
to next step.
STEP 5:
Call heat pump installer or AquaCal AutoPilot
Customer Support for further assistance.
“LP5” Indicator
Five low-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 “LP” Indicator. If
problem persists, contact AquaCal AutoPilot Customer
Support for further assistance.
“OtA” Indicator
Incoming water temperature
exceeded 110°F and unit is locked
(Over Temperature Alarm).
Heat pump will not operate until
incoming water temperature drops
to 100°F or lower.
Improper usage
of other heating
equipment
STEP 1:
Determine if another heat pump (gas heater, solar
heater, etc.) is heating water being sent directly to
heat pump. This situation will need to be corrected
before continuing to use heat pump.
Incorrect reading
from water
temperature
sensor
STEP 2:
Verify existing water temperature with an accurate
external meter. If heat pump’s sensor is inaccurate,
water temperature sensor requires replacement. If
error recurs, proceed to next step.
STEP 3:
Call heat pump installer or AquaCal AutoPilot
Customer Support for further assistance.
“FLO” Indicator
Low or no water flow detected.
Water pump off
or insufficient
speed
STEP 1:
Confirm water pump on. 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.