3
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
(systems with cylinder)
Scheduled control off period
Check schedule settings and alter if necessary.
All hot water from tank used
Ensure DHW mode is operating and wait for tank to re-heat.
Heat pump or electric heaters not working
Contact installer.
Water discharges from one of the
relief valves
The system has overheated/overpressurised
Switch off power to the heat pump and any immersion heaters then con-
tact installer.
Small amounts of water drip from
one of the relief valves.
Dirt may be preventing a tight seal in the valve
Twist the valve cap in the direction indicted until a click is heard. This will
release a small amount of water flushing dirt from the valve. Be very care
-
ful the water released will be hot. Should the valve continue to drip contact
installer as the rubber seal may be damaged and need replacing.
Noisy pipework
Air trapped in the system
Try bleeding radiators (if present) If the symptoms persist contact installer.
Loose pipework
Contact installer.
Heating system does not get up
to set temperature.
Prohibit, schedule or holiday mode selected
Check settings and change as appropriate.
Incorrectly sized radiators
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 flat.
An error code appears in the
main controller display.
The indoor or outdoor unit is reporting an abnormal condi-
tion
Make a note of the error code number and contact installer.
Pump runs without reason for
short time.
Pump jam prevention mechanism to inhibit the build up of
scale.
Normal operation no action necessary.
Mechanical noise heard coming
from cylinder unit
Heaters switching on/off
Normal operation no action required.
3-way valve changing position between DHW and heating
mode.
Normal operation no action necessary.
After DHW operation room tem-
perature rises a little.
At the end of the DHW mode operation the 3-way valve
diverts hot water away from the cylinder into space heat-
ing circuit. This is done to prevent the cylinder unit compo-
nents from overheating. The amount of hot water directed
into the space heating circuit is dependent on the type of
system and the pipe run between the plate heat exchanger
and the cylinder unit.
Normal operation no action necessary.
Schedule function inhibits the
system from operating but the
outdoor unit operates.
Freeze stat. function is active.
Normal operation no action necessary.
H e a t i n g m o d e h a s b e e n o n
standby for a long time (does not
start operation smoothly.)
Duration is set to excessively short time at “Economy set-
ting for pump”.
Contact installer.
Heating emitter is hot in the DHW
mode. (The room temperature
rises.)
The 3-way valve may have foreign objects in it, or hot wa-
ter may flow to the heating side due to malfunctions.
Contact installer.
<Power failure>
All setting will be saved for week with no power, after week Date/Time ONLY will be saved.
Parts which require regular inspection
Parts
Check every
Possible failures
Immersion heater
2 years
Earth leakage causing
circuit breaker to activate
(Heater is always OFF)
Pump
20,000 hrs (3 years)
Pump failure
Parts which must not be reused when servicing
* O-ring
* Gasket
note: always replace the gasket for pump with a new one at each regular
maintenance (every 20,000 hours of use or every 3 years).
Maintenance
Maintenance to the cylinder and hydrobox should be carried out annually by a competent person only. Users should not try to service or replace parts of the cylinder or hyd-
robox themselves. Failure to observe this instruction could result in injury to the user, damage to the unit and the product warranty becoming invalid.
In addition to 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 qualifications.
Parts which require regular replacement
Parts
replace every
Possible failures
Pressure relief valve (PRV)
Air vent (Auto/Manual)
Drain cock (Primary circuit)
Flexible hose
Manometer
Inlet control group (ICG)*
6 years
Water leakage due to
copper corrosion
(Dezincification)
*
OPTIONAL PARTS for UK
