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Grant vortex overheating problem

hsan

I recently installed a grant vortex boiler house module. Everything was fine for the first week but then the customer rang saying the boiler never cut in that morning. I called and it had went out on the high limit stat. I got some air out at the coil and everything worked fine for the next 11 days. But he rang me today saying he had the same problem. All he’s using it for at the moment is heating hot water, there are two motorised valves controlling upstairs and downstairs, it’s a sealed system, boiler stat seems to be cutting in and out fine when I turn it, new circulating pump fitted with install.... can anyone think of a reason please??

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Wearb

I presume pump is pumping in correct direction?
Turn your multimeter to temp and stick the temperature wire end in the pocket to check the boiler stat.
Does this still happen with boiler stat at lowest setting?
Did you flush the system?
What programme is pump set to?

Does this have a pump overrun? It might need one.

Just things running through my head after reading your post.

jimf

make sure the 2 probes are fully inserted into the pocket on the boiler

any comments from customer re rads/water getting super hot

hsan

jimf wrote: »

make sure the 2 probes are fully inserted into the pocket on the boiler

any comments from customer re rads/water getting super hot

Hi I had trouble getting one probe in alright because it was so tight. Ya he did say that the water was very hot even though the stat is down to the lowest. I had a laser to check the temps but I don’t think it’s very accurate

jimf

hsan wrote: »

Hi I had trouble getting one probe in alright because it was so tight. Ya he did say that the water was very hot even though the stat is down to the lowest. I had a laser to check the temps but I don’t think it’s very accurate

first place to look and rule out so

you should not have any difficulty getting probes in go back and take photo and post here

they are usually quite loose even

that is why I suggested thinking the run stat probe may have popped out

hsan

So I called there today, I just changed the circulating pump to rule it out for definite. I had the stat turned down to the lowest and I had a thermometer on the flow pipe and it got to 70 degrees so I manually plugged out the burner and let the pump take the heat away. I’m going to put in a service call but do ye think that the dual stat could be faulty? When the stat is down to the lowest should it cut out below 60 degrees or there or thereabouts?

jimf

sounds like a faulty stat run temp 55/75

I changed one about 3 months ago on a vortex with same issue

it can happen

the lads in grants are sound you will have no issue with them

hsan

jimf wrote: »

sounds like a faulty stat run temp 55/75

I changed one about 3 months ago on a vortex with same issue

it can happen

the lads in grants are sound you will have no issue with them

Thanks Jimf
Quick question, How old was the boiler that you changed the stat on 3 months ago?
I only fitted this boiler about 3 weeks ago

jimf

hsan wrote: »

Thanks Jimf
Quick question, How old was the boiler that you changed the stat on 3 months ago?
I only fitted this boiler about 3 weeks ago

only fitted a few days

hsan

jimf wrote: »

only fitted a few days

The only thing that’s bugging me is the fact that it worked for 5 days and then worked for 11.
Are grant usually good to sort out the problem themselves?

jimf

hsan wrote: »

The only thing that’s bugging me is the fact that it worked for 5 days and then worked for 11.
Are grant usually good to sort out the problem themselves?

grants are a1 just put a call in to technical on Monday

hsan

jimf wrote: »

grants are a1 just put a call in to technical on Monday

Ok, thanks for the help Jimf

jimf

hi hsan any update

roy rodgers

Just for interest what size boiler did you install?