Mend > Home Heating Systems

Baxi 105e HW but no CH?

Hi
Ive got a Baxi 105e which has developed a CH fault. Hot water works fine but flame will not remain lit when set to CH. It just constantly fires up then dies down, then the flame failure LED flashes, and it requires reseting. Had Engineer out who changed pcb and flame sensor (which works fine on hot water), but still same problem. Checked voltage supply, found to be 216V. Engineer thinks fault is due to low voltage. Called electricity supplier. They measured the voltage at the meter and concluded that it was within their voltage tolerance of between 216 - 253V! Phoned Baxi, who weren't very helpful, they couldnt give a tolerence for the supply voltage the boiler required. "Needs 230V mate, thats all I know". So now Im stuck in catch 22 with a boiler that doesnt work and a low supply voltage.
Am going to hire a generator/ invertor to put 230V supply on boiler to sort out whether its the supply voltage or the boiler at fault.

Steff
January 2006

Baxi Baxi 105e Heating, Home Heating Systems Boiler Flame Failure Pcb

if your hot water is working fine then this has absolutely nothing whatsoever to do with a low voltage supply as this wouldnt work either. On your boiler there are two identical sensors one for hot water and one for central heating did your "engineer" change the right sensor ( usually you would change both these if only one had failed as they run in series ) check this by swapping the leads from the ch sensor to the hot water sensor the ch sensor has green leads and hot water one red one is situated bang in the centre of the boiler behind the drop down panel and the other to far left run your heating with these swapped but dont leave like this if it works then email me @michaelhalliday4@hotmail.com

mike
January 2006