Deker 3,478 Posted February 4, 2008 Report Share Posted February 4, 2008 (edited) Potterton Netaheat 16-22 around 1986. Fires up runs for about 3-4 minutes then cuts out, waits a few minutes then repeats the process, only ever stays on for 3-4 minutes and heating never gets up to full temperature! No air in the system and main pump is fine. Any ideas please? Cheers Deker Edited February 4, 2008 by Deker Quote Link to post Share on other sites
rabitin girl 16 Posted February 4, 2008 Report Share Posted February 4, 2008 OH is a boiler engineer, Ill show him this when he gets in at about six Quote Link to post Share on other sites
bill88 6 Posted February 4, 2008 Report Share Posted February 4, 2008 Thermostat,or cicuit board.Im not a plumber,but had similar probs with my Potterton boiler. Quote Link to post Share on other sites
rabitin girl 16 Posted February 4, 2008 Report Share Posted February 4, 2008 Just asked OH , and he said Clean flame probe inside boiler, and check electrical connections and cable are sound between flame probe and PCB, If still dosent work replace PCB Quote Link to post Share on other sites
harrycatcat 31 Posted February 4, 2008 Report Share Posted February 4, 2008 I had that problem some time ago and it was the ball cock thing in the black tank in the airing cupbourd. It was stuck so no water going in the system and boiler kicking in and then stopping cos the bit in the boiler was hot enough. I am not a plumber though so I dont know, but it cured mine. Quote Link to post Share on other sites
Coney 3 Posted February 4, 2008 Report Share Posted February 4, 2008 Deker as these are quite old and without stripping it down you may whant to check the stats in the boiler it may be the heat stat is faulty and is cutting in before the boiler is reaching tempreture causing it to shut down (but this is purely a guess) I do know in the past this model has also had problems with the heat exchanger but to check this means a lot more work than checking the boiler/heat stat. Hope this helps Coney. Quote Link to post Share on other sites
Guest missymoo Posted February 4, 2008 Report Share Posted February 4, 2008 Is the boilerbeing used to heat Hot water? Is hot water ok? I know this sounds niave but how do yo you know pumps running?Have you taking aeration screw out of top of pump head to check.A lot of the older pumps will run for a short time then cut off.Does the boiler have a bi metallic limit stat ,prevents boiler from running dry. Quote Link to post Share on other sites
bill88 6 Posted February 4, 2008 Report Share Posted February 4, 2008 Potterton boilers always suffer with pcb (printed circuit board) problems,mine was faulty,but so was the thermostat,thats why i had both replaced. Quote Link to post Share on other sites
mikeylad 0 Posted February 4, 2008 Report Share Posted February 4, 2008 Potterton Netaheat 16-22 around 1986. Fires up runs for about 3-4 minutes then cuts out, waits a few minutes then repeats the process, only ever stays on for 3-4 minutes and heating never gets up to full temperature! No air in the system and main pump is fine. Any ideas please? Cheers Deker i would say take the screw out of head of pump def make sure is working.check overheat stat has not clicked out.if all ok i would say pcb from my experience with them Quote Link to post Share on other sites
Deker 3,478 Posted February 4, 2008 Author Report Share Posted February 4, 2008 Many thanks for all the replies.....pump wise YEP!!!I've had the screw out and its going a treat. Got to admit I thought is was the stat but probably the PCB (£100ish) and most of you appear to go with that as well. MANY MANY THANKS TO YOU ALL FOR TAKING THE TIME Quote Link to post Share on other sites
Deker 3,478 Posted February 4, 2008 Author Report Share Posted February 4, 2008 Is the boilerbeing used to heat Hot water? Is hot water ok? I know this sounds niave but how do yo you know pumps running?Have you taking aeration screw out of top of pump head to check.A lot of the older pumps will run for a short time then cut off.Does the boiler have a bi metallic limit stat ,prevents boiler from running dry. The boiler does everything and the hot water gets there in the end but never quite manages to get the heating up to temp, rads are hotter upstairs than down but I put that down to hot rising and simply not enough hot water to go round all the rads, flushed the system a couple of weeks back and fully bled now! Screw been out of pump..running fine. Need to get the front off the boiler to check what sort of stat is fitted...Trouble is it is wall mounted but VERY built in..a fairly major task to get the front off but got to be done! Quote Link to post Share on other sites
IanB 0 Posted February 5, 2008 Report Share Posted February 5, 2008 I had a problem with my combi with luke warm hot water and heating, turned out to be the heat exchanger being full of crap after it had just been fitted, debris etc... probably not your problem but worth a look for the time it would take, just remove it and flush clean under a tap... Quote Link to post Share on other sites
minion 29 Posted February 5, 2008 Report Share Posted February 5, 2008 Well if you decide you need a new boiler give me a shout. I can get great prices for cash bud. And delivered anywhere in the UK. Quote Link to post Share on other sites
boris b 1 Posted February 7, 2008 Report Share Posted February 7, 2008 air flow sensor . Quote Link to post Share on other sites
Deker 3,478 Posted February 7, 2008 Author Report Share Posted February 7, 2008 air flow sensor . Oh f**k...I can work out most of the rest but how do I recognise/find/test this? Cheers Deker Quote Link to post Share on other sites
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