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Every few days our hot water boiler keeps turning off and we do not have hot water for the showers". Repair men have been there but the problem persists. First they replaced a fuse. Second they lowered the temp from 200 degrees to 180 degrees. They are not finding the problem. Why would the boiler shut down but start right up again for a number of hours after pushing the reset button? We have mostly copper piping and we just had a new larger expansion tank installed 6 months ago.

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  • michaelreiss Apr 14, 2009

    It is a Laars Mighty Therm

  • jeryrigger May 20, 2009

    I had the same problem, had to change the fuel filter, shut-off valve, nozzel, and it still didn't work. Itwas acting like it wasn't getting enough fuel, took the fuel pump off, put in a vice took it apart and cleaned the massive amount of gunk out of it and works like new! Hope this helps you.

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If you have to push the reset button it suggests that the boiler/water heater is over heating.What boiler is installed?

Posted on Apr 14, 2009

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Posted on Jan 02, 2017

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In your case, the diverter valve has most likely failed. Normally, when the heating is on this senses when there's a demand for hot water and temporarily diverts the primary hot water circuit to feed the domestic hot water heat exchanger. When the demand for hot water ceases the primary hot water circuit is diverted back to the central heating heat exchanger. The valve has a number of moving parts including a rubber diaphragm which can wear out and split and moving shafts which can seize.

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Call a heating engineer out as soon as possible; I'm not going to advise how to do the repair yourself as gas appliances MUST be serviced by qualified persons only for reasons of safety. If you're lucky then the valve simply needs cleaning up and a few new diaphragms plus other minor seals and rings. If it's gone too far then the valve and possibly the manifold it's attached to will need to be replaced.

In the UK the part alone typically costs between £100 to £200 depending on whether it's just the valve or the manifold as well. The diaphragm kit typically costs up to around £15 and is routinely fitted when the boiler is annually serviced, and a new valve will already have new diaphragms fitted. For a routine service expect to pay for up to two hours labour (many can be done in one hour), but if the valve/manifold have failed it will be longer as one failure often causes other parts to need further inspection/repair.

I hope that I've helped you today, if so please return the favour by rating my answer.

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