Baxi Duo-Tec Combi 40HE Hot water tripping off and on?

[bobnlibby]

Hi guys, pleaseeeeeeeeee help.

Our Baxi boiler as above works great on central heating but the hot water side keeps cycling through hot and cold on about ten second intervals. Our plumber first tried checking the thermistors and cleaned out hot water sensor, still did not work. Then he cleaned out the hot water heat exchanger and it worked briefly then went back to the ten second on/off cycle, please someone point us in the right direction

Many thanks, Bob.

 

[glenno1]

flow switch,diverter valve,pcb arcing

 

[bobnlibby]

Also i am a mechanical engineer with a good skill base and have fixed previous boilers after advice but obviously i will not touch the gas side but wondered what i could do myself?

 

[neily01]

have had the same fault i believe on a vokera and it was the diverter valve spindle had been leaking and filedl the actuator with water. first time id ever seen it was able to open the head and dry it out repaired the spindle leak, was ok after that. hope that helps as i dont know the set up of the duotec's.

 

[bobnlibby]

Hi guys, thanks for your help with this. New plate heat exchanger now fitted and all is good ;-)