This is overheat stat kicking in i believe.What is the best approach to remedy this.the boiler was fitted 4 year's a go, and not flushed before boiler was fitted.could this be the problem???
glow worm 30 cxi f5 fault
- Thread starter xfr
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your boiler has overheated, there is a reset switch inside the boiler but before you go looking for it I strongly suggest you find out why it tripped in the first place, as it wasnt flushed the pump would be a good place to start.
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well its been fine for a month after a flush and fernox tf1 filter fitted.the f5 fault has reappeared any ideas on what to look for next.
are bottom radiators cold?
no there hot 
Maybe pump, thermisters or filters. Either that it will need a real powerflush. Worst case power flush and heat exchanger.
Does the F5 happen when the heating is on? if so check the return filter as it may be blocked.
If it only happens on hot water it could be the sanibloc or the plate heat exchanger blocked.
It may also just be a weakening pump. Good luck.
If it only happens on hot water it could be the sanibloc or the plate heat exchanger blocked.
It may also just be a weakening pump.
Good luck.
I would change both the thermisters on the h/w and c/h.
Cheap enough repair!
The boiler appears to be bypassing one of them before locking out on the upper limit stat.
Servotech,
Cheap enough repair!
The boiler appears to be bypassing one of them before locking out on the upper limit stat.
Servotech,
Why would you blindly change them when you had not tested them and found them to be faulty?
What would you do next if that did not solve the situation?
Tony
I hada good one with a saunier duval where the installer put the flow restrictor for the dhw on the central heating!!!! doubt it will be the thermisters and as Tony pointed out why not test them first?
Sounds like it is over heating
Sounds like it is over heating
Well it's F5 fault again seems to go 3-4 weeks before it does it again.
glow worm engineer coming out tomorrow.
if he can't cure it what chance have i got
glow worm engineer coming out tomorrow.
if he can't cure it what chance have i got
Hi, I've had the F5 problem now for 8 days. Here's what's happened up to now:
1. New thermostat - not fixed
2. New Heat exchanger - not fixed
3. New PRV valve - not fixed
Any thoughts or ideas???
Philip26
1. New thermostat - not fixed
2. New Heat exchanger - not fixed
3. New PRV valve - not fixed
Any thoughts or ideas???
Philip26
DIYnot Local
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