boiling water in header tank

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cb23

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• 6 Jan 2003

• #1

I have a consistent problem with the central heating in that after an hour's use, hot water is being pushed up the over-flow pipe and in to the header tank causing that to over flow with boiling hot water.

The thermostat on the boiler appears to work as it clicks on and off when I adjust and there are no obvious air blocks in the system (all radiators are piping hot all over).

 

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AnonymousImport

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• 6 Jan 2003

• #2

:eyes what number do you run the boiler on

 

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AnonymousImport

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• 6 Jan 2003

• #3

we have tried all settings and the problem still occurs. However, you have just reminded me that the problems only started after fitting a new pump.

 

B

breezer

• 6 Jan 2003

• #4

have you tried turning the speed of the pump down?

 

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AnonymousImport

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• 6 Jan 2003

• #5

Yes. There are 3 settings and all lead to the same problem. I might try timing it to see if the higher setting makes the problem occur quicker though.

 

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AnonymousImport

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• 6 Jan 2003

• #6

I had this problem and eventually discovered that the water pump had been fitted the wrong way round...check the arrow on the pump in relation to correct direction of flow.

Good luck

 

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• 10 Jan 2003

• #7

I HAD THE SAME PROBLEM LAST YEAR AND THE CAUSE OF THIS WAS THE THERMOSTAT IN THE BOILER WAS FAULTY,TRY REPLACING IT IF YOU CAN.

GOOD LUCK

ANDY

 

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anorak

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• 26 Feb 2003

• #8

Did you ever resolve your problem, I'm experiencing exactly the same symptoms?

 

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masona

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• 2 Mar 2003

• #9

I had a similar problem.Could be your boiler thermostat need replacing or cleaning. I took the boiler thermostats apart and blew out the dusts & hoover and turn the setting slightly down.It's now okay ! I think what happening, the boiler is overheating the water too quickly and therefore expanding to the expansion tank via the vent. I also turn up the pump setting to number 3 to speed up the water flow to reduce overheating. This is the cheapest way of finding out !