Combi boiler help please, running hot then cold...

blackshirtuk

gas4you wrote: »

The heat from the system water can't transfer across the plate to the domestic cold to be heated quick enough.

The boiler registers the system side is up to temp so shuts off, then comes back on again when it cools.

Which could be as a result of low flow.

the dhw side isn't flowing quick enough to cool the system water before the boiler shuts off. reducing required dhw temp reduces system water temp so the dhw can cool the system water enough so the boiler keeps firing.

I agree the HE plate may indeed be blocked /scaled which will cause reduced flow

Jimbojuanos1980

hI ALL.


Ive just signed up to simply show what i also had a problem with.

My hot water was running hot cold hot cold And i could never get a hot bath once it was left for 15 mins.

A few days ago I had left my heating on full blast and then forgot to turn it off and then this is when the problem started again with the heating not being on and the hot water never running hot all the time.


My boiler is not on a timer. I switch the heating on when i want it and turn it off when i want. but heres a few pictures that hopefully will help some people. I didnt want to call out a guy because simply im skint. but after playing a little im getting hot water now running out my bath water all the time well its running now and im checking it. and its working.


here are the pictures.










Its probabaly an old boiler. ive been in this flat my first for 5 years now and morgate but hope the pics help anyone


Ive also just founf I cant post pictures so that makes this even harder

MY HEATING DIAL IS AT 1/3RD
MY HOT WATER DIAL IS AT 2/3RDS

NOT THE EASIEST SITE TO USE WHEN YOU WANT TO SHOW PICTURES OF YOUR FIRST EXPEREINCES BUT HEY HO.