Fault Finding - Baxi Combi 630 User Manual

7 Troubleshooting
7.2

Fault finding

Tab.10 Problems and solutions
Problem
There is no domestic hot wa­
ter.
The radiators are cold.
The boiler is not working.
22
Possible causes
The boiler is not working.
The DHW function is switched off.
The water pressure is too low (< 0.5 bar). Re-pressurise the system.
Insufficient flow.
The temperature set point for the heating
is too low.
The heating mode is deactivated.
The radiator valves are not open.
The boiler is not working.
The water pressure is too low (< 0.5 bar). Re-pressurise the system.
The temperature set point for the heating
is too low.
No demand for heating.
No power supply.
The water pressure is too low (< 0.5 bar). Re-pressurise the system.
The boiler is indicating an error.
The gas pressure is too low.
Condensate drain blocked.
If the boiler is not working also check section "Operation checking
procedure and basic fault identification" or contact your Installer.
Solution
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.
Activate the DHW mode.
Flow must be at least 2.5 litres per minute.
Increase the value with the CH temperature knob
or if a room thermostat is connected, increase the
temperature on the room thermostat.
Activate the heating mode.
Open the valves of all radiators connected to the
system.
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.
Increase the value with the CH temperature knob
or if a room thermostat is connected, increase the
temperature on the room thermostat.
Ensure that timers & thermostats are calling for
heat.
Check that the boiler is being supplied with power.
Check the fuses and switches.
Press the Reset button.
Correct the error, if possible.
Check whether the gas isolation cock is fully open.
Open the gas isolation cock.
Check drain, especially any external runs in freez­
ing temperatures.