Pilot light going out?

[mcniven]

Alright team

Went to a floor standing old boiler today and what's happening is the pilot light is going out after about 5 minutes of the boiler being u
And running, not just the burner going out but the full pilot.

Does this still point towards thermocouple even although it stays lit for the first 5 minutes?

Thanks man!!

 

[JAP&H]

Only me, but would renew thermocouple and see what happens.

Is there an FSD (tube type) fitted, they can put the pilot out though.

 

[mcniven]

I've not opened her up yet just relit pilot got a call as I was driving home

 

[Millsy 82]

What boiler is it

 

[dancinplumba]

Check pilot is touching tc, if not check pilot injector, check when main burner lit if it's being pulled away from tc, if ok check tc then tc interuptor if fitted, gas valve. Has it go o/heat stat ? Is pump running ?

 

[Rickster123]

I would say its an over heating problem.

 

[dancinplumba]

Yea after five mins me too. Probs pump

 

[mcniven]

Would overheating cut off the pilot?

 

[mcniven]

Millsy unsure was last min of day just looked and relit

 

[dancinplumba]

Would overheating cut off the pilot?

Yep via interrupter. Check pump working

 

[mcniven]

Dancinplumba what exactly does an imterupter do? Is it a stat

 

[mountainman]

An interruptor is an overheat 'stat that acts on the thermocouple, so if the sensor operates due to the appliance overheating or sometimes spillage of POC then the thermo-electric valve drops out shutting off the gas to the main burner and pilot.

 

[galaxy_plumbing]

its a bi-metalic strip on thermocouple lead, when overheated it will interrupt the circuit and TEV will shut

 

[mcniven]

Mountain man how does it detect POC?

So most likely because the burner is staying a light for 5 minutes really tells me that the thermocouple is working and that most likely it's an overheat issue and on this type of system that points at the pump. Which...... Could be anywhere!!

 

[mcniven]

Boiler is ideal Mexico 2