Hot water kitchen - Cold water bathroom

denso13 · 2026-02-07T17:23:23+0000

andsotobed said:
Diverter needs toi divert somewhere, so if the combi is detecting the flow, but no hot water in bathroom... Where has it all gone?

You said the heating flow was warming up?

andsotobed · 2026-02-07T20:41:17+0000

Assuming that the diverter is faulty, would the radiator water not be diverted into the hot water system. I mean, if it diverts one way should it not also from time to time divert the other way too?

andsotobed · 2026-02-07T20:42:20+0000

I have not noticed the radiators getting warm, but will run a test tomorrow morning once the radiators go off.

CountryFan · 2026-02-07T21:30:18+0000

andsotobed said:
Assuming that the diverter is faulty, would the radiator water not be diverted into the hot water system. I mean, if it diverts one way should it not also from time to time divert the other way too?

Not really no.

andsotobed · 2026-02-08T14:52:43+0000

so where is the hot water going? Hot water tap is open, boiler fires up, cold water comes out of the tap. What is the boiler heating up, and if it is water, where is it all going to?

andsotobed · 2026-02-08T15:03:29+0000

oooh, another thought, could the heat exchanger be responsible somehow?

andsotobed · 2026-02-08T15:04:10+0000

radiators all stay stone cold

denso13 · 2026-02-08T15:05:54+0000

andsotobed said:
oooh, another thought, could the heat exchanger be responsible somehow?

Get the diverter fixed first.

whistler · 2026-02-08T15:40:44+0000

Can you isolate the cold feed to the bathroom then see if hot water comes through the mixer tap?

CountryFan · 2026-02-08T15:43:27+0000

andsotobed said:
so where is the hot water going? Hot water tap is open, boiler fires up, cold water comes out of the tap. What is the boiler heating up, and if it is water, where is it all going to?

I thought it was established that it’s circulating around the heating system.

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Hot water kitchen - Cold water bathroom

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