Hello all im new. (modena 102 ch prob)

[brianpara1]

Please can somebody offer any help.
Modena 102 ch prob. When heating kicks in (everything is good) the pressure gauge soon (after about 30 seconds) flickers then rises to about 3 bar, then cuts out, and will not start again for about 2 hours.
At 3 bar the prv opens and the expelled water is extremely hot, also the ch pipe out fo the boiler is extremely hot. Dhw working fine.
Thanks for any replies

 

[chris watkins]

Expansion vessel is flat / needs replacing, call a plumber/heating engineer who will carry out a boiler service, if you have not had one carried out in the last 12 months & sort it out.

 

[brianpara1]

could I use one of the rads as an ev to check

 

[brianpara1]

The ev seems to be ok, there is air in it.
How can I check if the pump is working?

 

[mountainman]

could I use one of the rads as an ev to check

A new one on me, what do you mean?

Honestly, take Chris's advice and get a professional in.

 

[brianpara1]

If I empty a rad (fill with air ) will it not act as an expansion area?

 

[clarky101]

If I empty a rad (fill with air ) will it not act as an expansion area?

Superb!!!

 

[glenno1]

The easiest way to check parts are working is call a gas safe engineer

 

[southcoastboile]

In theory that would work by leaving one end open but why would you want to go to all that trouble to save yourself a callout charge? you would have to get a gs engineer to fit the vessel anyway, if thats what was wrong. I can think of 5 reasons your boiler would be doing that and you could not legaly fix any of them.

 

[brianpara1]

I have money problems and would like to try and fix it myself

 

[glenno1]

I understand your situation and sympathise but if we give you advise,we are really helping you break the law

 

[clarky101]

Why dont you post on the plumber/ gsr in your area thread then maybe someone on here can help you,,,

 

[brianpara1]

Thanks for the advice, but surely if i just test things (like the pump) and not change things (saving me money) i am not breaking any law

 

[jtsplumbing]

save you testing the pump its working for hot water.

 

[clarky101]

Get a GSR guy in mate it'll be cheaper in the long term rather than you tinker with your boiler & cause more problems.....mind you you'll probably do it yourself....

 

[DirksPlumbing]

The flickering and high rise will surely go in conjunction with a boiling noise. As it is a gas boiler every part in it except user controls underly gas works legislation as every part can influence the safe function of the boiler.

If you want to safe money then ask a qualified person for a quote.
If you take one out your neighbourhood he would not need to drive for hours and could possibly have fixed the problem on the first visit within an hour.
Or if there are major problems he could have advised you on how to proceed.

The ketteling in your boiler might do plentiful damage whilst you are testing the boiler.

 

[brianpara1]

I dont think the pump is used for hot water on modena 102 boilers

 

[AWheating]

welcome to the forum brian.

 

[brianpara1]

problem now sorted, it was the electrical plug in connection of the pump to the boiler (was burned out). Thanks for all the advice