Back Boiler Trips Water Heater Thermostat

[lesp]

Hi

Thank you for taking the time to read and hopefully provide a solution

Water tank Heated by economy 7

However we also have started using the coal fire again

never used to be a problem

however we using the fire has statrted tripping the thermostat on a regular basis

( social housing tenant )

have had the thermostat replaced but tripped again the day after

help would be apreciated as having to ligt the fire just to get hot water

 

[kerching]

Should this not be reported to the Housing Association and let them sort it out?

Or are you responsible for all repairs?

Just wondering

 

[NozSpark]

It sounds like your fire is heating the hw cylinder to a higher temperature than the immersion safety stat can take, and its now tripping (it is normally resetable btw)

Other than drawing off hot water when the fire is on or reducing the heat/time the fire is lit I can't think of a safe solution

 

[lesp]

Hi kerching

No it is their responsibility and they have replaced the thermostat once and reset once

last time 3 months ago tripped the day after

however they have to make a 50 mile round trip so thought it was rather a waste of their resources

so have struggled on for the last few months

--------------

Hi NozSpark

would probably do no good resetting as would only trip once the fire was going again

and yes the water is soo much hotter when heated by the fire

regards les

 

[NozSpark]

Is there a radiator on the gravity circuit from the back boiler?

If so openening the valves fully might help

 

[ProDave]

There is nothing you can do. Modern thermostats have to have this safety trip and the coal fire is simply heating the water too hot.  Years ago thermostats never had this second safety trip so it wasn't an issue.

Only some radical re plumbing to create a dump radiator to stop the water tank getting too hot will solve this.

Or learn to reset it yourself and reset it whenever you want to heat by electricity.

 

[Evans Electric]

As Dave says ,  this is becoming problematical ,  the gas central heating or ( in your case) coal fire , trips the safety trip as they are calibrated to the thermostat  .

Its the over heat safety trip the way , not the thermostat that is tripping out .

I was getting a call out every year ,  when summer came , the customer changed back to the immersion heater ...to find it had tripped due to the central heating being hotter than the immersion .

The least they could do is make the trip accessible , with a big red button or something .