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EN
Service and Maintenance
5
Troubleshooting
The following table is to be used as a guide to possible problems. It is not exhaustive and all problems should be
investigated by the installer or another competent person. Users should not attempt to repair the system themselves.
At no time should the system be operating with the safety devices by-passed or plugged.
Fault symptom
Possible cause
Solution
Cold water at taps
System or power input is OFF.
Turn on the power/system
DHW is scheduled "OFF"
Check schedule settings and change if necessary.
All reserves of hot water from thermal store tank
have been used.
Ensure DHW mode is operating and wait for thermal store
tank to re-heat.
Heat pump or booster heater not working
Contact installer.
Air exists within pump A
Contact installer.
Flow sensor jam / defect
Contact installer.
Supply fl ow rate is too low.
Increase the delivery amount. (open tap further.)
Heating system does not get
up to set temperature.
Prohibit, schedule or holiday mode selected
Check settings and change as appropriate.
Incorrectly sized radiators or low fl ow rate setting
Contact installer.
The room in which the temperature sensor is
located is at a different temperature to the rest of
the house.
Reposition the temperature sensor to a more suitable room.
Battery problem *wireless control only
Check the battery power and replace if fl at.
After DHW operation room
temperature rises a little.
At the end of the DHW mode operation the 3-way
valve diverts hot water away from the thermal
store tank into space heating circuit. This is only
temporary and done to prevent system components
from potential overheating. The amount of hot
water directed into the space heating circuit is
dependent on the pipe run between the outdoor
unit and the cylinder unit.
Normal routine operation no action necessary.
Heating emitter is hot in
the DHW mode. (The room
temperature rises.)
The 3-way valve may have foreign objects in it,
or hot water may fl ow to the heating side due to
abnormal malfunctions.
Contact installer.
Schedule function inhibits the
system from operating but the
outdoor unit is operational.
Freeze stat function may be active, to prevent
freezing.
Normal operation no action necessary.
Pump runs without reason for
short time.
Pump jam prevention control routine to inhibit the
build up of scale.
Normal operation no action necessary.
Mechanical noise (minor)
heard coming from cylinder
unit
Booster heater switching on/off
Normal operation no action required.
Pump operates during hot water supply
Normal operation no action necessary.
3-way valve changing position between DHW and
heating mode.
Normal operation no action necessary.
Abnormal cylinder noise
during delivery of domestic
hot water supply
Air present in pump A
Contact installer.
Noisy pipework
Air trapped in the system
Try bleeding radiators (if present) If the symptoms persist
contact installer.
Loosely supported pipe work.
Contact installer.
Water discharges from one of
the pressure relief valves
The system has overheated or overpressurised
Switch off power to the cylinder unit and the booster heater
then contact installer.
Small amounts of water drip
from one of the pressure
relief valves.
Dirt may be preventing proper tight seal in the
valve
Twist the valve cap in the direction indicated until a click is
heard. This will release a small amount of water fl ushing dirt
from the valve. Be very careful the water released will be
hot. Should the valve continue to drip contact installer as the
rubber seal may be damaged and need replacing.
An error code appears in the
main controller display.
The indoor or outdoor unit is reporting an abnormal
condition
Make a note of the error code number plus any other
observation(s) and contact installer.
<Power failure / outage>
Following any power failure (i.e. interrupted power input), ALL settings will be SAVED for a 1 week period only.
After 1 week, only Date / Time will be SAVED upon main controller.
Service and Maintenance
5
Maintenance
Maintenance to the cylinder unit and outdoor unit should be carried out annually by a competent person only. Users
should NOT try to service or replace parts of the cylinder unit by themselves. Failure to observe this instruction could
result in injury to the user, damage to the unit and invalidate product warranty.
In addition to routine annual servicing it is necessary to replace or inspect some parts after a certain period of system
operation. Please see tables below for detailed instructions.Replacement and inspection of parts should always be
done by a competent person with relevant training and qualifi cations.
Parts which require regular replacement
Parts
Replace every
Possible failures
Pressure relief valve (PRV)
Air vent (Auto)
Manometer
6 years
Water leakage
Parts which require regular inspection
Parts
Check every
Possible failures
Water circulation pump 1
(i.e. main heating circuit pump)
50,000 hrs (7 years)
Water circulation pump
failure
Parts which must NOT be reused when servicing
* O-ring
* Gasket
