Hi Folks, I'm kind of new to the forum. I've read quite a few posts and found very useful information for plumbing, decorating and joinery - Great stuff. However after a bit of searching I found a few posts with Worcester Highflow 400 RSF problems but not this problem - I had the boiler (its 7 or 8 years old) serviced by British Gas 2 weeks ago as part of the cover I have, later that day it stopped heating the hot water, heating seems to be working. The trip switch on the right hand side comes out, when I push it in we get hot water again for a minute or so before it pops back out again. I have now had 3 different BG engineers, they have visited 6 times and changed pump, thermocouple and heat exchangers (both which took the guy about 12 hours over 2 visits) - still same problem.

I'm now sitting waiting for another visit but don't have much confidence in them, at least not the guys who have visited so far. Any help or advice/suggestions? Please don't tell me I need a new boiler. They obviously, north of the border, have a diferent approach to us southerners! Perhaps in some areas, but when I worked for the dark side, the east of Scotland patches had, consistently, the lowest recall rates in the whole of the uk. For the OP, the highflow had numerous problems with nuisance overheating. If as suggested by Agile, the problem is not with thermistors then I would suggest looking at the small (6mm?) impulse pipe at the back of the diverter valve.

If this is blocked the valve will not operate properly. We have also had a couple of faulty high limit stats resulting in nuisance trips. Tell the guy to be VERY CAREFUL if he has to drill the high limit phial from the heatbank. I learned from bitter experience. The highflow boilers are prone to blockages. Usually the hydraulic assembly on the left hand side, the top amnifild, bottom manifold, some of the later ones had a filter on the cold mains feed. What I'd do hear, which BG keep quiet is that you can insist on a manufacturers visit.

If Worcester bo to the boiler then they will carry all the bits and won't want to re-visit. Sometimes you end up with pretty much a new boiler. They work on these all the time. Thats my recomondation. If they say no, just stamp you feet and insist.

HI Steve thanks for that suggestion. I'm not brave enough to take the facia panel off but I'm sure you're correct there's a problem with the pump. I've just paid £400 + to get an engineer out tomorrow with a service plan. I wish I was more technical but I'm freezing here and had to something quickly. Many thanks for the suggestion once again. HI Steve thanks for that suggestion.

I'm not brave enough to take the facia panel off but I'm sure you're correct there's a problem with the pump. I've just paid £400 + to get an engineer out tomorrow with a service plan. I wish I was more technical but I'm freezing here and had to something quickly. Many thanks for the suggestion once again. If you know what the circulator pump is, see if it is pumping.

Eroda Gps Software Download. First turn the power switch on the side of the unit off. Turn the thermostat on.

Then turn the power switch back on. Usually the coupling assembly (2 metal pieces connected together with springs) is visible if the pump is red. If the pump is green and named gruenfos, put the metal tip of a screwdriver against it and the handle to your ear, this will act like a stethescope and determine if you can hear it. If you know what the circulator pump is, see if it is pumping. First turn the power switch on the side of the unit off. Turn the thermostat on. Then turn the power switch back on.