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Heating/hot water

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By *MB9 OP   Man
1 week ago

Northampton

Yesterday and today I've had an engineer round because my heating and hot water had packed up. My boiler is saying low water pressure.

Yesterday's guy found a small leak in a radiator pipe, fixed it and got it working. Ten o'clock last night it stopped working again.

Today's guy could find no leak, refilled the boiler, got it all working again. I've come home this evening and it's gone again!

So, a third phone call will have to be made in the morning. I want to offer them my own solution but know as much about plumbing as I do about the working minds of women.

Any advice will be greatly received and if you're local maybe a thank you treat!

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By *illyloverMan
1 week ago

EH54

There is still a leak some where as they are re pressurising the system and as it leaks the pressure drops.

This in turn will activate a low pressure switch that will switch the system off before it damages the empty HX etc

They should pressure back up and take a reading every so often to see it the pressure drops again.

If it does all the joints on your system will need to be checked and tightened where possible.

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By *arridMan
1 week ago

Brighton

Might be a faulty expansion vessel. Inside boilers like those from Worcester Bosch or Vaillant there’s a rubber diaphragm tank that absorbs pressure changes. If it fails pressure rises when heating is on then the boiler dumps water through the safety valve then the pressure then drops to low pressure - which is exactly what you’re seeing — works after refill, then dies again later. This is extremely common and engineers sometimes miss it on quick visits. or it might be the Pressure Relief Valve stuck open because when pressure gets too high, the boiler releases water through a pipe outside and sometimes after being triggered it doesn’t reseal properly. Look for a small drip from a copper pipe outside your house or pressure slowly dropping over hours. Or it might be a small leak.

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By *MB9 OP   Man
1 week ago

Northampton


"There is still a leak some where as they are re pressurising the system and as it leaks the pressure drops.

This in turn will activate a low pressure switch that will switch the system off before it damages the empty HX etc

They should pressure back up and take a reading every so often to see it the pressure drops again.

If it does all the joints on your system will need to be checked and tightened where possible. "

Thank you 🙏

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By *MB9 OP   Man
1 week ago

Northampton


"Might be a faulty expansion vessel. Inside boilers like those from Worcester Bosch or Vaillant there’s a rubber diaphragm tank that absorbs pressure changes. If it fails pressure rises when heating is on then the boiler dumps water through the safety valve then the pressure then drops to low pressure - which is exactly what you’re seeing — works after refill, then dies again later. This is extremely common and engineers sometimes miss it on quick visits. or it might be the Pressure Relief Valve stuck open because when pressure gets too high, the boiler releases water through a pipe outside and sometimes after being triggered it doesn’t reseal properly. Look for a small drip from a copper pipe outside your house or pressure slowly dropping over hours. Or it might be a small leak. "

Thank you 🙏

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By *ndreaNWCDTV/TS
1 week ago

Paphos

Can simply be that the expansion vessel needs repressurising… make sure your gas engineer has checked it…

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By *limboy68Man
1 week ago

St Albans


"Might be a faulty expansion vessel. Inside boilers like those from Worcester Bosch or Vaillant there’s a rubber diaphragm tank that absorbs pressure changes. If it fails pressure rises when heating is on then the boiler dumps water through the safety valve then the pressure then drops to low pressure - which is exactly what you’re seeing — works after refill, then dies again later. This is extremely common and engineers sometimes miss it on quick visits. or it might be the Pressure Relief Valve stuck open because when pressure gets too high, the boiler releases water through a pipe outside and sometimes after being triggered it doesn’t reseal properly. Look for a small drip from a copper pipe outside your house or pressure slowly dropping over hours. Or it might be a small leak. "

Excellent advice - for me it has often been very small, almost undectable pipe/radiator leaks. Use a bit of tissue or look for staining on fittings or on the floor below the radiator valves. Fittings often need re- tightening after some years. Had two of these on a new system for 8 months and was topping up pressure every fortnight. Now, never top up. Also some top- up valves themselves next to the boiler sometimes leak. Let us know how you get on.

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By *MB9 OP   Man
1 week ago

Northampton

A leak has been found on a piece of pipe going through the wall between the living room and bedroom which is causing the pressure to drop. It's now a bigger job than initially thought.

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