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Boiler working hot water, but no heating,. i have just returned from working abroad 6 months, the water pressure bar had gone back to nil. i filled loop. 2 bar. and reset, electric switch fired boiler. but no heating, cant understand.

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Hi,
In most cases problems with the circulator pump boil down to two problems.
The most common is air in the lines causing an air lock.
The next problem is that the pump gets stuck and is not running even though itmay be hot and seem to be running. In this cause the pump can sometimes betaken apart, cleaned and it will work, but usually it needs to be replaced.

Here is a tip that I wrote that will explain circulator pump problems in moredetail.

Heating Circulating Water Pump Problems

heatman101

Posted on Apr 03, 2011

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Posted on Jan 02, 2017

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2 Answers

Why can't i fill my boiler


You didn't specify what kind of boiler you have. Some low pressure steam boilers have a manual fill valve as well as an automatic float switch valve. Hot water boilers have a pressure reducing valve that constantly monitor the boiler pressure and maintain 12 to 18 PSI for the safety of the boiler. If the boiler runs out of water there is a good chance it will rupture and become unrepairable. If you are saying your boiler won't fill, and its a hot water boiler, the pressure reducing valve is probably blocked with sediment and needs replacement. The valve is in the water line that feeds directly into the boiler return line from city water. Hope this helps.

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Sounds like the expansion vessel in the boiler has lost pressure or is faulty. If you have a tyre pressure gauge, locate the expansion vessl and check the pressure via the schraeder valve. It should be around 1.5 bar. If there is no pressure you can re pressurise it with a bicycle pump. Should it not pressurise then you will need a new one. The pressure relief pipework outside is damp because the system is over pressurising at relieving pressure at 3 bar. This obviously causes a system pressure drop. You can install a pressure vesel into the heating return pipework should accessing the boiler be difficult.

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Baxi 105 he


on the pipework near the boiler there should be a silver flexi hose connecting the two copper pipes ...this is called a filling loop there sould be taps on the filling loop turn on by moving the black plastic taps do this slow ..at the same time look at the pressure gauge on a baxi do not go over 1 bar...............

warning ..if the boiler has lost pressure where has it gone..is there any leaks anywhere..if it persist contact a engineer

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