15
Fault Correction
Carry out the following before calling out the installer or service engineer:-
Inadequate or no heating
Ensure that the power to the boiler is switched "on" at the mains switch beside the meter, and the isolator
beside the boiler. The flashing light on the tele meter will indicate the power consumption, this light will
not show if it is a "power off period". A red light should be visible through the aperture on the boiler front
cover. If the boiler power is switched "off" then "on", after a short delay the relays can be heard to click in
on the control panel at the front of the boiler. If the power supply is on and no light is visible on the boiler,
it is likely that a fault has shut the boiler power off. The installer or a service engineer will have to be
called to rectify the fault and restore the power supply.
Hot Water but no heat at the radiators
Check that the circulating pump is running or the programmer/thermostat/timer is asking for heat.
Water Discharging from the Tundish
(Visible drain connection on the side of the Boiler)
Switch off the main switch (beside meter) or the isolator switch (beside boiler)
If water still flows through tundish, turn off water supply to boiler.
Call installer.
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Maintenance
It is recommended that all electric combination boilers are serviced annually by the installer or his
approved agent.
It is also recommended that the concentration of the central heating protector be checked to ensure that the
boiler and radiator system are protected against corrosion.
In addition the following checks must be made:-
1. The correct operation of the expansion pressure relief valves. (central heating and hot water
systems)
2. The correct operation of the temperature and pressure relief valve fitted to the side of the boiler.
3. The operating pressure of the pressure reducing valve (3 bar) on the cold water supply. (clean the
water strainer if fitted)
4. Check the pre-charge pressure on the heating system (pressure gauge on the small expansion
vessel) If the pressure is low the system can be recharged by connecting the braided flexible hose
to the system and opening the valve till the pressure gauge reads 1.5 Bar. .(The pressure on the
gauge will increase as the system heats up).
5. Check the pre-charge pressure in the expansion vessels. (heating and hot water)1.5 Bar for
heating and 3Bar for the domestic hot water
6. Check all the fuses, and all cable connections to ensure the fuses are intact and there is no
evidence of overheating at the connections.
7. Check the input current to the boiler by reducing the temperature by running off some domestic
hot water or running the heating system to ensure that the boiler is drawing full power. This is best
achieved by using a clamp meter on the mains cable.
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