Myson apollo 50s, pilot keeps going out.

[OPS]

Hi All, saw a myson apollo 50s yesterday, pilot kept going out, have put 2 different thermocouples in it, it stays lit for up to 5/6 hours then goes out again. Any suggestions. Cheers John

 

[Billy Bob Bob]

are you gsr john?you need to join the gsr only forum and the plumbers arms pm dave in admin your business details

 

[southcoastboile]

does this boiler have an interupter? i think it does, if so this is the likely fault, they also suffer with the top hats wearing, make sure you are getting a nice flame from the pilot assembley

 

[OPS]

i am gsr so will pass on my details. The thermocouple i took out wasn't an interrupted type, the one specified wasn't either? pilot flame looks ok i think.

 

[southcoastboile]

i thought it was on these boilers, is there a linked stat on the heat exchanger?
Another thought, i had a simalar fault a few years ago.... is that, the guvoner on the meter is faulty, the one I had the boiler worked fine and kept getting called back after changing thermocouple etc, turned out that when the hob was turned on it knocked the pilot out, so check wp at boiler with all appliances running and wp at meter. Just to rule this out

 

[Billy Bob Bob]

as far as i remember they are the apollo has a low water content heat exchanger so has a high limit thermostat built into the thermocouple via a interrupter

 

[southcoastboile]

eah thats what i thought gas man, 2 blak wires that link to the spade connections on the thermocouple with those stupid litlle screws

 

[CES]

I just changed a thermocouple on one last week and it was an interrupted one.

 

[Billy Bob Bob]

just checked mi,s no interrupter on this one can only be one other component

 

[OPS]

defo wasn't one of those fitted previously, the gas spares shop checked for the correct thermocouple on their computer and gave me one without? will check working pressures to rule out governor.Cheers

 

[Billy Bob Bob]

defo wasn't one of those fitted previously, the gas spares shop checked for the correct thermocouple on their computer and gave me one without? will check working pressures to rule out governor.Cheers

thermocouples correct,pump overun stat or interrupter not part of the thermocouple on this boiler,it is unlikely to be working pressures or the Governor but worth a check anyway

 

[OPS]

Cheers for your replies, could it be a dodgy gas valve?

 

[Billy Bob Bob]

thats why you need to join the gsr forum,but if your a gsr engineer its a simple elimination process,i cant give you the answers on a open forum but your working it out for your self

 

[Puddle]

check fins on heat exchanger are all clear,clean as required if not maybe

 

[warrington]

Could be gas valve pilot solenoid

 

[Billy Bob Bob]

check fins on heat exchanger are all clear,clean as required if not maybe

good point puddle they are prone to being neglected

 

[CES]

I just changed a thermocouple on one last week and it was an interrupted one.

Apologies, it was an Apollo 30/50B I was working on