Potterton combi 80 central heating running then cutting out then back on again

[richardo]

Hi please could you help i have a combi 80 the central heating runs for 5mins or so then stops & then starts up again then repeats.

 

[moony]

circulation or room stat.

 

[richardo]

Hi moony Ive got no room stat fitted the boiler has had a new pcb board

 

[moogwai]

Have these boilers got the filters inside flow and return valves??? Turn valves off drain down boiler and remove filters and clean. Deffo sounds like a circulation problem.

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[richardo]

Hi moogwai i cant see eny filters in there.

 

[mattyp]

Are the radiators getting hot ? does the central heating temperature dial on the front of the boiler rotate fully from the minimum setting to the maximum ? [ if it was a clock from 12 - 9 ?]

 

[moogwai]

Hi moogwai i cant see eny filters in there.

can you post a pic of the valves to see if im right about them? if im right you can unscrew the front cap on the valve and remove a filter....it'll be like a cylindrical gauze...get yer finger in there and have a feel!!

 

[moogwai]

no your right.....it dont have the valves on that i thought...just looked at the manual for it.

 

[richardo]

Hi rads are getting hot & the mechanical timer is working.

 

[mattyp]

I dont mean the timer !! You should have a central heating temprature dial on the front of the boiler it should move from the 12oclock[ min temp] position round to the 9oclock position [ max temp]

 

[richardo]

No there is no clock but there is an adjuster on the pcb board

 

[moogwai]

could be the ch sensor

 

[mattyp]

NOOOO im not talking about any clock !!! just on about the central heating dial,on the front of the boiler and where it should move to and from !!

 

[moogwai]

NOOOO im not talking about any clock !!! just on about the central heating dial,on the front of the boiler and where it should move to and from !!

lol.....mattyp calm down before you have a seizure.....by looking at the manual it doesnt look like the 80combi have a ch temp dial.

and to be honest i think the boiler is coming to the end of its life and some parts may be obsolete......so if you can i'd look at renewing.

 

[mattyp]

Im ok mate ! just trying to help, as you know it can be very hard !!

 

[moogwai]

too true mate....lol...it does make me laugh though when you read through the threads and you see the engineers slowly start to loose their rag...makes me giggle every time!

 

[Marc.White]

check the pump, check the switched live from the room stat.

 

[moogwai]

check the pump, check the switched live from the room stat.

he said there's no room stat fitted...must just be controlled by the on/off button on the front panel.

 

[Marc.White]

A friend told me the other day..... to check to see if the pump windings have gone: turn it off Remove the bleed cap and stick a screwdriver in the slot on the spindle. whilst the screwdriver is in slot on the spindle, turn the pump back on. If you can hold the srewdriver still and stop the pump from spinning, then the windings have gone! If the pump spins the screwdriver out of your hand, then there OK. I havent tried this yet and is not a very professional move. water will also be coming out of the pump so unless you can contain the water it might not be a good idea!!! But even if it is all ok it doesnt mean the propeller has sheared off the motor!!!! If any one knows of any other pump checks please let me know.

 

[Marc.White]

sorry missed the bit bout the stat

 

[richardo]

Hi thanx for all your help could it be the vessel

 

[richardo]

its had a new ch thermostat in the boiler

 

[richardo]

? Could it be the air flow switch