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Radiant combi boiler put hot water tap on boiler fires up then goes out then lights up again and keeps on doing that

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Either defective sensors, or check the flow temperature going into the plate heat exchanger, if this getting very hot, but not circulating out the other side, it will probably be a blocked or restricted - replace

Posted on Mar 03, 2009

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Maybe the diverter valve motor is not working B&Q ~£12.

Posted on Dec 11, 2008

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Britony 80 combi boiler G31 propane, gas flow rate =0.124877 cubic meters per hour, inlet pressure 37mbar, room sealed flu Manufactures recommended Co2 & NFGT unknown, cold water from hot tap when...


You gave a good description of the boiler--
now we need to hear the clues you have observed, as it fires (or fails to fire-- or what?)

Or as the water flow-- or doesn't flow?
As the cold water enters-- what does the flame do?
And does the flow rate reduce as the flow gets to the divert er valve?

How old is the boiler?-- and have we been using HARD water?
(Any water softener in the circuit to remove calcium and magnesium, etc.?)
Do you suspect a scaling problem in the interior parts?
If so-- can you circuit an acid thru the innards, to clean up the scale?

Please comment on what happens when water and gas flow-- so we can help you get to the next step.

Mack B

Jan 17, 2011 | Heating & Cooling

1 Answer

We have a Worcester Bosch Highflow 400 (10 year old) combi boiler. Over the last few weeks when we have put on the heating the boiler kicks in and fires up and the heating comes on (the water comes on fine...


The by pass pipe may be limed up. This apparently causes a reduced flow which will stop the heating side of the thing working. Call out Worcester Bosch engineer. It costs £210 including VAT and most parts and they almost guarantee to get it working.

Nov 06, 2009 | Ruud Matching Split Air Conditioner

1 Answer

Clock on comi boiler


it may be the preheat setting on the boiler for the hot water circuit. do the radiators get hot when the boiler fires up with the time clock off ? if not then there is nothing to worry about if it is only on for a short time.

Jan 04, 2009 | Heating & Cooling

1 Answer

Vaillant combi boiler problem


when the tap is turned on and the water light on the boiler doesn't this means the diverter valve is not operating it could be down to low water pressure in the house this can be checked at the cold tap in the kitchen. if there is plenty of pressure then it could be the diagphram in the diverter valve is worn or split. the diagphram is only a few pounds but it depends on the engineer you get as to how much money he wants to fit it.
the egg timer symbol (or two pyramids together) is an ignition indicator turn off and on again to see if it will fire with the tap running. reset the boiler with the lower right hand control knob.

Dec 31, 2008 | Heating & Cooling

1 Answer

Vaillant Ecotec combi boiler - radiators working but no hot water flow to taps


David,

The fact that you're getting a little burst of domestic hot water suggests that the boiler is capable of circulating hot primary loop water through the heat exchanger, but doesn't necessarily do so when it needs to.

What seems to be lacking is a recognition that domestic hot water is now being drawn off, and that the boiler needs to fire up and divert the primary flow through the heat exchanger.

A good place to start might be the flow switch (usually in the bottom of the boiler, where the cold water supply comes in) or the electrical connections to it.

A.

Oct 05, 2008 | Heating & Cooling

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