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Working bar pressure raising over 3bar when central heating on

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My central heating turns off when i turn the hot water tap on. when i turn it off the central heating doesn't come back back on until i turn the power off and on.


Combi-boiler-turn hot water tap on/off and the heating stops for ...

singletrackworld.com/.../combi-boiler-turn-hot-water-tap-onoff-and-the-...
Combi-boiler-turn hot water tap on/off and the heating stops for 20secs ... hot watertakes priority over central heating so when you run the hot tap, heating is ... Yeah onmy worcester combi there is a diverter valve - it feeds either the heating or ...

My central heating works but I have no hot water - 24'7 ...

https://www.247homerescue.co.uk/my-central-heating-works-but-i-have-...
Diverter valves switch heat between the hot water and the central heating. When youturn your hot tap on, the diverter valve temporarily shuts off the water supply ...

Does your boiler keep switching itself off? Here's why ...

www.dhs-uk.com/does-your-boiler-keep-switching-itself-off-heres-why/
Jul 7, 2015 - ... Bathroom Suites, - Showers, - Wet Rooms, - Taps and Accessories, Information and ... Low water pressure can cause your boiler to turn itself off. ... boiler is not turning off, you aren't getting the amount of hot water you require. ... If there is air in your central heating system, then your boiler may shut down.

Feb 09, 2016 | Water Water Heaters

1 Answer

Pressure gauge keeps going down when the central heating goes off ,it is fine when it is on the pressure stays high


Is your central heating unit a heatpump w/ electric heat or natural /propane gas ? And what is the water heater, gas or electric ?

Dec 07, 2015 | Water Heaters

1 Answer

Why does the pressure rise to over 3bar when the central heating is in operation ?


3 Bar = 43.5 PSI When you heat water it always expands increasing pressure.
In a closed vessel volume can increase by 2-3%. Either expansion tanks allow for this and PSI is maintain or without an expansion outlet the PSI will increase in proportion to heat supplied.
Is this a low temp hydronic boiler operating at or <140F, a hi temp hydronic boiler @ >180F or steam boiler?

Oct 18, 2014 | Water Heaters

1 Answer

Central heating not working but hot water is ok.


If when you turn power off you wait a while it is probably not the central system coming on. You have a triple aquastat that maintains a temperature level needed to provide hot water. but you are not getting the thermostat to operate the central heating. The thermostat is a switch that operates by temperature. if you have tried raising the thermostat and the system did nor kick in. try jumping the thermostat terminals in the aquastat . if that works then the problem is either in the thermostat or the wiring to the thermostat. also with a electrical tester." while the thermostat is jumped" test the c1 and c2 terminals to see if power is going to the circulator. If not then you need a new aquastat. if you have power and the pump is not moving water replace it.

Oct 13, 2014 | Water Heaters

1 Answer

Ravenheat 80/20 boiler. the boiler looses water pressure but only when working in central heating mode. Boiler holds pressure indefinitely if central heating is not used,hot water can be drawn without a...


Hi, your boilers pressure should be holding 1.5 bar with the relief set about 3. If the pressure is below this the flow switch will cause the boiler to stop as theirs not enough pressure to operate. Another thing, does your boiler have an auto fill system or do you need to plug a hose in to fill it? If its an auto fill system and you lose pressure you could have a leak.

Sep 15, 2013 | Water Heaters

1 Answer

I have an ariston 20/24 mffi combi pressure rises when switched to central heating but pressure ok when asking for hot water ? expansion vessel ?


over heat limit stat on central heating circuit ? if hot water is ok and hot to temp when run for 5 minutes the expansion vessel is doing its job.remember hot water is the maximum demand for any boiler ,,heating is secondry?once you establish hot water at maximum rate then the only real problem is on you demand for heating??

Dec 10, 2012 | Water Heaters

1 Answer

Hi there. Our valiant boiler doesn't seem


Lack of pressure in the primary circuit [radiators] Look for a pressure gauge should read between 0.5 & 1.5 bar
Somewhere there is a tap/valve/pipe connection to refill & looks like a small thumb turn or a screwdriver turn on a connection on the mains water inlet pipe. turn on until you get the right pressure then off

Dec 16, 2009 | Water Heaters

1 Answer

Bled radiator and now boiler is losing pressure


if your boiler is a combi re-pressurise locate filling loop and refere to manual

Oct 09, 2009 | Water Heaters

1 Answer

My pressure release valve is releasing water off of my well x trol connection. Tank pressure guage is above 45 psi. What could be faulty.


pressure release vaulve usually open any pressure over 3bar so probly vaulty vaulve,maybe got sum grime or **** in it might need a clean.gd luck

Aug 09, 2009 | Water Heaters

1 Answer

The hot water and central heating wont work together


what size of gas line is going into boiler and water heater? is it black iron ? natural gas or propane? have you checked gas pressure at water heater and furnace ? if they work fine individually then you have a problem with incoming gas pressure. Call gas company and ask them if they would come out and check gas pressure.

Feb 03, 2009 | Water Heaters

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