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Discuss No hot water upstairs in the Plumbing Forum | Plumbing Advice area at PlumbersForums.net

Messages
15
You are getting hot water downstairs with a hot tap only opened but not upstairs with a hot tap only opened, if the hot tap flow upstairs for whatever reason is less than 2.5 to 3 LPM then a flow switch in the combi will stop it firing, see how long it takes to fill a 1 litre jug/bottle.
It’s filling a 1L bottle in 0.8.36?
 
Messages
15
Iv just discovered if you put the heating on while running upstairs tap and shower it works fine? Or I may be coincidence but it wasn’t working 2 minute before I tried that
 
Messages
1,760
It’s filling a 1L bottle in 0.8.36?
That's >
Iv just discovered if you put the heating on while running upstairs tap and shower it works fine? Or I may be coincidence but it wasn’t working 2 minute before I tried that
Switch off the C heating but leave both the hot tap and the shower on and see if water still hot, the tap alone at > 7 LPM should keep the flow switch very happy but it may be faulty, also measure the hot tap flow rate downstairs only but all upstairs shut down.
 
Messages
15
That's >

Switch off the C heating but leave both the hot tap and the shower on and see if water still hot, the tap alone at > 7 LPM should keep the flow switch very happy but it may be faulty, also measure the hot tap flow rate downstairs only but all upstairs shut down.
No mates it’s not hot now Iv turned it off
 
Messages
1,760
So no hot water upstairs with hot tap and shower on but C.heating off, is downstairs still hot on its own?. (also flowrate)
 
Messages
15
I’ll get flow rate in morning bud,

yes hot water down is fine with out central heating. But Iv been told to put the heating on for 20 min and check all radiators and one in my boys bedroom upstairs doesn’t get hot.

i went to turn it off and thought I’d check pressure first, it was on 2 and the needle was shaking all over as soon as I turned dial to turn heating off it went straight back down to 1.5?
 

Gasmk1

Gas Engineer
Messages
1,854
what boiler is it, from description your tap upstairs does not have enough flow to allow the hot water flow switch to activate. It is more Than likely a boiler problem so get a RGI to look at it
 
Messages
1,760
Could be the flow switch but strange that no hot water upstairs with both hot tap and shower both on, hot tap gives > 7 LPM on its own, hot tap downstairs may give a very high flowrate but does look like boiler (oil or gas) fault.
 
Messages
15
We’ve spoke to a few people today and they have suggested it could be the Diverter valve or something? Does this sound like something it could be?
 

Gasmk1

Gas Engineer
Messages
1,854
I said flow switch to make it easier for you to understand that is why I asked which model of boiler is it
 

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