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Resurrecting old point on Netaheat mk2F. Sure malfunction of boiler due to over-heating as putting doubled alum. foil between control 'box' and boiler bottom seems to eliminate failure and boiler chugs along OK but hot++. Prob affecting function of pressure switch as it seems to fail at that...

Like a dog with an old bone. The cold feed seems to go to the back of the boiler - is it likely to go direct into the HE or somewhere else (where could it go?) then into the HE? If so, could I intro the HCl into the HE via the cold feed pipe at the F&E tank opening and then just flush through...

I'm blinded by science! Well at least it's led to an interesting discussion - it obviously helps to have a Chemistry degree to be a heating engineer. So ... is my best bet using FX-2 (as the stronger available chemical) for a lot longer in the flusher or to just bung it in the system for a...

quote]Alban, the real point about my comment that you have another thread running with this Had posted again in older thread but thought it was 'dead' and therefore not looked at, my mistake. Noted now your reply to that thread - seems that to see new responses have to hit 'refresh' button...

Bathjobby - yes you did address this in my last thread but couldn't see any kind of drain plug at base of HE - as I said just these plates on each side plus 2 bolts holding on combustion chamber wall. Ditch it? 20+ years old yes, but working OK in all other respects. Low income due to health...

Tried chemicals, descaling, powerflushing with chemicals, changed pump (and now up to setting 3), checked mot. valves all to try to stop boiler overheating and cutting off when boiler therm. turned above Min. setting (this occurs very quickly before water has fully heated up). Fan looks OK too...

Bathjobby or anyone You wrote that HE on Netaheat has drain plug lower left hand corner but couldn't see it when heating engineer came round. Just a bolt to secure the wall of combustion chamber on each side. Diagram on Partsarena (Netaheat MkIIF) shows no plug but shows two plates bolted on...

FX2 - the Kamco-supplied desludger. Powerful, but I'm going for broke! The 'garden' approach I tried with two rads - it took a lot of effort, was messy ++ and it's really the boiler I'm after to desludge - does P/fling really get a good flow through it with all the rads closed off? Where do...

Trad open-vented system 20+ yrs old with Netaheat 16/22. In process of P/Flushing - when flushing any individual rad with others turned off only the bottom line between the therm and lock/s valves warms up if at all but not main body as per instructions. Funny thing is that the rads when used...

OK OK I understand now that to mess with the Netaheat is like messing with the Grim Reaper! It seems easy enough with care but then what do I know about boilers? Point taken. Thanks for the cautions. It's just that when a bit strapped for cash, to pay £150 for a part that is £30 from a parts...

Hi Have old Netaheat Mk2F Corgi engineer did service and I discussed fault with him. Boiler over-heating and sometimes cuts out with fan going but no pilot. Chugs along on min boiler temp. setting OK. Some improvement with new pump and cleaning system with chemicals. Blowing down pressure...

Hi I have posted re this problem before and have tried to follow advice. Also searched. Boiler runs OK for a few mins and then shuts off with the front getting too hot to touch (is that normal?). Will keep going (just) on min setting starting and stopping. Higher setting leads to permanent...

Hi There is a black plastic cylinder about 4" tall (with an unscrewable red cap on) stuck on the end of a section of pipe coming from the HW cylinder central heating pipe. It seems to be dribbling a small amount of water. Is this a PRV? If so should it be open or closed (it can be turned) and...

Have replaced pump! No change with boiler performance however. What should I go for next? I tried system with mot. zone valves both manually open but no difference either. Boiler shuts off prematurely before heating has cranked up enough and front gets too hot to touch. Boiler doesn't make a...

Chris, Prised pump open but the copper coil that drives the rotor comes away too with the housing, so the rotor doesn't move when pump switched on. I can move the rotor so it's free to move. I can't seem to get a look at the business-end of the rotor which impells the water directly either as I...

Thanks Yes opened upstairs bleed valves on rads There are 2 mot zone valves. F&E empties when pump running so exit prob not blocked? Re using mains pressure do you mean doublecheck there's a valve protecting the mains water supply? Is a vent pipe the one that hangs over the F&E tank? If...

Hi Have tried to just drain down open system after putting in Superfloc. I get good flow from drain with pump on but it diminishes and stops long before even F&E tank empty (ball valve restrained) when pump off. I drained from lowest point on system (a drain point on a cul-de-sac to the...

Hi Thanks for replying Chris Do you have to apply a fair bit of pressure to prise open the pump casing? It doesn't want to shift despite undoing 4 screws and trying to undo central black plastic cap/screw. Also does it matter if the elec supply is not necessarily off? There's a switch next to...

(Re-submitted from another thread as probably confusing to mix the two problems although they seem similar) Hi I have a problem with Netaheat 16-22 (20+ yrs old). Started shutting down allowing rads to go cold. Heating limps along on minimum setting firing up OK but for short periods only but...

Hi I have similar problem as described with Netaheat 16-22 (20+ yrs old). Heating limps along on minimum setting firing up OK but for short periods only but if I crank up thermostat on boiler it shuts off finally after outer casing gets very hot to touch and then rads go cold. All rads warm up...