8.3 Fault finding
Tab.14 Problems and solutions
Problem Possible causes Solution
There is no domestic hot wa
ter.
The boiler is not working.
Check that the boiler is being supplied with power.
Check fuses and the switches.
Check whether the gas isolation cock is properly
open.
If the property has a prepayment meter ensure it
has sufficient credit.
The DHW function is switched off. Activate the DHW mode.
The water pressure is too low (< 0.5 bar). Re-pressurise the system.
Insufficient flow. Flow must be at least 2 litres per minute.
The radiators are cold.
The temperature set point for the heating
is too low.
Increase the value with the CH temperature knob
or if a room thermostat is connected, increase the
temperature on the room thermostat.
The heating mode is deactivated. Activate the heating mode.
The radiator valves are not open. Open the valves of all radiators connected to the
system.
The boiler is not working. Check that the boiler is being supplied with power.
Check fuses and switches.
Check whether the gas isolation cock is properly
open.
If the property has a prepayment meter ensure it
has sufficient credit.
The water pressure is too low (< 0.5 bar). Re-pressurise the system.
The boiler is not working.
The temperature set point for the heating
is too low.
Increase the value with the CH temperature knob
or if a room thermostat is connected, increase the
temperature on the room thermostat.
No demand for heating. Ensure that timers & thermostats are calling for
heat.
No power supply. Check that the boiler is being supplied with power.
Check the fuses and switches.
The water pressure is too low (< 0.5 bar). Re-pressurise the system.
The boiler is indicating an error. Press the Reset button.
Correct the error, if possible.
The gas pressure is too low. Check whether the gas isolation cock is fully open.
Open the gas isolation cock.
Condensate drain blocked. Check drain, especially any external runs in freez
ing temperatures.
If the boiler is not working also check section "Operation checking
procedure and basic fault identification" or contact your Installer.
8 Troubleshooting
400 Combi 2 25
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