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Boiler fires up for five seconds then shuts down then fires up for five seconds continually

Hi when the boiler comes on in the morning all is fine until i turn on the hot tap. i then get constant hot water. when the hot tap is turn off it should then go back to heating.but then it keeps turning its self on and off every 5 seconds this is also the case for the hot water. if boiler is turn down and left to cool down it will work fine again until i call for hot water again. this happens both ways. i.e if i turn on water first all is fine until i turn on the heating

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: Combi Boiler - Running warm & then cold!? HELP!

mixing valve must be replaced

Posted on Nov 02, 2008

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SOURCE: combi cutting out and overheating

is this a baxi 105? chances are you diaphragm has gone on your diverter valve. Or your diverter valve.
Do you will initially get a liitle hot water if your heating is on?

Posted on Dec 30, 2008

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SOURCE: alpha 240e boiler wont fire up for hot water, will for heating

most likely the diverter valve.. when hot tap turned on the movement of the water through the valve operates a diaphragm which pushes a pin/button//switch to tell the boiler to fire up

Posted on Sep 02, 2009

mrhotandcold
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SOURCE: Vaillant ecoMAX 828/2boiler goes on & off when running hot water!

water must be set at 3lts a min ,check diaphragm valve move when hot tap is on, check microswitch ,best of luck

Posted on Oct 12, 2009

mrhotandcold
  • 248 Answers

SOURCE: Combi boiler will not fire up for hot water or heating.

check tops of spindles at radiator valves for leaks easy repaired set pressure to .8bar setting at 1.5 may be make overpressure and blow off through high/pressure releasese valve

Posted on Dec 03, 2009

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