Estia HWS-1501CSHM3-E, Installation Manual, Page: 11 / 15

AIR TO WATER HEAT PUMP SYSTEM INSTALLATION AND SERVICE MANUAL
11
EN
10.0 FAULT FINDING
The table below lists some common faults, their possible causes and their remedy. Any
servicing of the water cylinder and Air to Water Heat Pump system must be carried out
by a trained competent installer.
FAULT
No hot
water flow
Water from hot
taps is cold
Water from hot
taps is only
warm
Water from hot
taps is too hot
Water discharges
from Pressure
Relief Valve
continually
POSSIBLE CAUSE
1. Mains water supply off
2. Mains water filter
(if fitted) blocked
3. Inlet water control valves
incorrectly fitted
1. Controller on Heat Pump Hydro
Unit set to Space Heating only
2. Heat Pump not working
3. Faulty water cylinder temperature
sensor
1. Cylinder heater thermal cut-out
has operated
2. Faulty water cylinder temperature
sensor
1. Water storage temperature on
Heat Pump Controller is set too
high
2. Faulty water cylinder temperature
sensor
1. Mains water pressure too high
2. Pressure Relief Valve seat is
damaged
REMEDY
1. Check and turn on mains water
supply
2. Turn off water supply. Remove
filter and clean in accordance with
manufacturers instructions
3. Check and refit as required
1. Check setting
2. Check operation of Heat Pump.
If a fault is suspected consult the
Heat Pump Manual
3. Check sensor operation.
Replace if necessary
1. Check. Reset by pushing button on
cut-out
2. Check sensor operation. Replace if
necessary
1. Check and adjust as required
2. Check sensor operation.
Replace if necessary
1. Refer to section Important
Installation Points for correct
pressure. If necessary
fit a Pressure Reducing Valve
to inlet water supply
2. Remove and replace