I drained the system to repair a dripping rad valve. When I refilled and turned system back on (HW/CH) the 3 amp fuse next to the boiler blew within about 5 seconds. This fuse also covers the circuit to the airing cupboard where the cylinder, pump and heating controls are, so everything stopped working.
With trepidation I replaced the fuse and switched back on. The timer, pump, motorised valves and cylinder and room stats are all working but the boiler does not fire up.
My guess is that the fuse blew because an electrical component in the boiler had just died. Is there an easy way to identify which component this is by doing a continuity test? I removed the lower panel to expose the wiring. The relay looks a bit black inside. Can I test it easily?
[17.30] I have now tested the basic function of the relay by turning up the boiler thermostat from off with the power on and the bottom cover off. The relay clicks visibly and audibly but there is no subsequent sparking (as far as I can tell) or firing.
If the part which caused the fuse to blow is a different one, is it straightforward DIY to change an electrical component once identified?
I have bled the air from all the radiators and the air from the bleed point on the piping from the cylinder in the airing cupboard and do not believe there to be any air in the system but perhaps there was when the boiler tried to fire up the first time and that caused the component to "go".
Any advice would be welcome.
With trepidation I replaced the fuse and switched back on. The timer, pump, motorised valves and cylinder and room stats are all working but the boiler does not fire up.
My guess is that the fuse blew because an electrical component in the boiler had just died. Is there an easy way to identify which component this is by doing a continuity test? I removed the lower panel to expose the wiring. The relay looks a bit black inside. Can I test it easily?
[17.30] I have now tested the basic function of the relay by turning up the boiler thermostat from off with the power on and the bottom cover off. The relay clicks visibly and audibly but there is no subsequent sparking (as far as I can tell) or firing.
If the part which caused the fuse to blow is a different one, is it straightforward DIY to change an electrical component once identified?
I have bled the air from all the radiators and the air from the bleed point on the piping from the cylinder in the airing cupboard and do not believe there to be any air in the system but perhaps there was when the boiler tried to fire up the first time and that caused the component to "go".
Any advice would be welcome.