My Baxi Combi 105e cuts in and out but works ok for hot water?

Manual here:

http://www.baxi.co.uk/documents/Baxi_Combi_105_Installation_and_Service_Manual.pdf
Run through the fault finding chart for starters.

macsco
January 2017

Hi i wonder if anybody can help me with my baxi 105e boiler. We had the diafram changed yesterday and we had lovely hot water great thought problem was solved, this morning luke warm water again and now it is freezing. The rads are heating up fine no probs.

Maxine
December 2008

I have just fixed the 2yr problem on my baxi 105e boiler.
The problem was sometimes it would fire up and sometimes not and sometimes first led would be lit and not others, also when CH was on and a tap was used for hot water the CH would not fire back up.
I do alot of car electrics and diagnosing faults so I would not recommend anyone trying what I am about to say unless they are confident. I stripped and removed the CB and found the CH reostat [adjustable resister]Temp control was detached from the board on two of the solder joints [sometimes when the CH was working and i wanted to lower or raise the temp when i just lightly touched the knob the CH would kick out] So I removed both the CH an HW reostats swopped them and resoldered onto board and the boiler now works perfectly and the hot water temp is also adjustable.......Get your soldering irons out!!!!!!

kickstart
November 2008

i had a similar prtob,changed the pcb,,still the same,,in the end it was a sticky microswitch

jim
January 2008

i had a similar prtob,changed the pcb,,still the same,,in the end it was a sticky microswitch

jim
January 2008

my baxi combi 105e cut in and out but works .the neon illuminateds .fault on central heating sensor.do i need to replace the sensor.

anthony gardner
November 2005

I am looking for the circuit diagram as well.No it is not common
Is all the LED's fine it should give even for a second some kind of LED information?Is the any?It could be hot temp sensor?
PCB is expensive most of the time you can not returnd them back have you read the information;
http://www.baxi.co.uk/literature/pdf/Baxi-Combi-Instant-105e/248741_06.pdf
I hope it has been any help

Yucel
February 2005