I am a new poster to this forum - not a heating professional, but a householder looking for advice. please.
I have a Glow worm 18hxi boiler with Magnatech installed in 2006 by a local engineer who has serviced it regularly and comprehensively every year - very competent, has done a lot of work for me over the years always very thorough and high quality. The boiler has performed well, though in 2016, when my usual engineer was in hospital, Glow worm/Vaillant had to replace, "the electrode, gas section, heat exchanger door seal and zig ignitor".
Just before my most recent service a week ago the boiler failed and showed fault F4. I reset but a day or so later it failed (F4) again. at the service the only visible fault was what appeared to be a very small amount of rust on the back plate which might indicate a small leak of condensate. The amount was tiny and possibly old because it was dry and could be rubbed off. Engineer thought it unlikely to be causing fault, but said should be monitored and would have a look in 6 months. Could find nothing else wrong, but made an adjustment to CO2 level on gas valve due to F4 fault. Unit started and ran perfectly on test, but failed next day and again today after running for a few minutes. Engineer spoke to Glow worm/Vaillant Technical who are currently guessing at a PCB fault, though I get the impression they are scratching their heads a little. My own question is could this be the case because the boiler starts and runs for some minutes before cutting out?
Any additional ideas would be most welcome please.
I have a Glow worm 18hxi boiler with Magnatech installed in 2006 by a local engineer who has serviced it regularly and comprehensively every year - very competent, has done a lot of work for me over the years always very thorough and high quality. The boiler has performed well, though in 2016, when my usual engineer was in hospital, Glow worm/Vaillant had to replace, "the electrode, gas section, heat exchanger door seal and zig ignitor".
Just before my most recent service a week ago the boiler failed and showed fault F4. I reset but a day or so later it failed (F4) again. at the service the only visible fault was what appeared to be a very small amount of rust on the back plate which might indicate a small leak of condensate. The amount was tiny and possibly old because it was dry and could be rubbed off. Engineer thought it unlikely to be causing fault, but said should be monitored and would have a look in 6 months. Could find nothing else wrong, but made an adjustment to CO2 level on gas valve due to F4 fault. Unit started and ran perfectly on test, but failed next day and again today after running for a few minutes. Engineer spoke to Glow worm/Vaillant Technical who are currently guessing at a PCB fault, though I get the impression they are scratching their heads a little. My own question is could this be the case because the boiler starts and runs for some minutes before cutting out?
Any additional ideas would be most welcome please.