Baxi 80he Luke warm hot water | Bathroom Advice | Plumbers Forums

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antony5378

Apologies, I know this subject has come up before but I have failed to find a solution from searching the forums.

I have a baxi combi instant 80he which has developed a potential fault. On the DHW side when the preheat has run out the hot water drops to a luke warm temperature. The Flow rate is unaffected, however if the flow rate is reduced the temperature increases. From reading similar problems on here I decided to change the diverter valve, which did not solve the problem. in anticipation of some answers below is what I have considered so far:

1. Faulty temperature sensor - wouldn't this be indicated by a false temperature display on the boiler. I.e boiler shows hot water is 70degrees but actual temp at the tap is noticeably less. Are the temperature indicators on the boiler for DHW or central heating?

2. Heat exchanger is scaled - problem occurred overnight.

3. Boiler is undersized - problem occurred overnight.

4. Seasonal temperature swing and the boiler cannot heat the cold water quick enough in winter - although I notice a difference annually this winter has been significantly worse.

Is there anything else to consider?
 
Simon thank you for your advice. The 'pro' engineer confirmed my initial assumptions that it was the diverter valve. He wanted £200, so far it's cost me £60. Assuming he would not refund the costs for a false diagnosis I still have £140 to play with.

What is the purpose of this forum. I thought it was to assist others and knowledge share?
 
Simon thank you for your advice. The 'pro' engineer confirmed my initial assumptions that it was the diverter valve. He wanted £200, so far it's cost me £60. Assuming he would not refund the costs for a false diagnosis I still have £140 to play with.

What is the purpose of this forum. I thought it was to assist others and knowledge share?

It's for the safe share of knowledge, at the end of the day you have an issue with a gas appliance and as such need a gsr engineer.

So you've had an engineer out, probably paid him nothing and then gone and changed the valve yourself. Jog on.
 
What is the purpose of this forum. I thought it was to assist others and knowledge share?
this forum will not condone diy working on gas appliances. you have had a "pro" engineer i presume he was gas safe. you really must not work on gas appliances yourself. our advice is to get the original engineer or another one to sort your problem for you.

this tread is closed.
 

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