brittany combi se 80 with intermittent hot water

guys,
i have the above boiler, and before xmas had a problem where i had no hot water, i called an engineer who replaced the diaphragm and piston on the 3 way valve between the CH and DHW. for this i payed a lovely sum of £240! and i still have an intermittent fault.(he did say though it might not fix it when he finished..) i am therefore wary of calling them out again until they have replaced every part!

when i switch the shower on, if i alter the temp of the water the boiler drops out and i get cold water. the only way to get it back is to either get out and turn a tap on or to turn the shower off then back on again.

the flow switch is fine, but i do have a small leak somewere as there is a small drip every day. also i have to recharge the system every 2-3 weeks. is there anything i can do or do i bite the bullet and ring an engineer..

thanks in advance

stuart

honest not that good boiler and they do leakit could anything from fualty thermister to pcb

adlplumbing said:

honest not that good boiler and they do leakit could anything from fualty thermister to pcb

Click to expand...

i know, everyone says the same

Just had a further look and have noticed the purple wiring going into what I assume is the thermister have scoring marks on them caused by the yellow cap, going to splice the wiring, ps am I correct in saying the thermister is a small black switch going into the black plastic piping after the mains water valve and it has a brass knurled figment to hold it on place?? Because there is a green copperlike rust around it.

Appologies for the grammar, typing on the mobile!