boiler only works for 3 minutes

[bluesky]

a friends boiler- ideal excel, room sealed, system--- works for only 3 minutes then stopped, the boiler looks very old, the gas pressure is fine, what is most common fault for the boiler? shall i check the flame detection electrode first?

cheers in advance

 

[Billy Bob Bob]

well is it going to lock out?does it have detection? if so do a continuity test on the probe and lead

 

[SimonG]

Is the pump working?

 

[bluesky]

hi gasman, do you mean there should be continuity between probe and lead? how much should it be?

SimonG, i have not seen the boiler, will check it out tomorrow,

cheers chaps

 

[REDSAW]

continuity is continuity, is either is or aint.

 

[bluesky]

just had a look, the fun is running but no ignition at all now, the pump is fine, the flame detection lead has continuity, checked thermistor on the water pipe, both about 0.3Ohm, took off the pilot burner and looks very clean, i am thinking the electrode is gone because i cannot see the sparking when is fun is running, shall i buy a new ignition electrode? how to check it is ok or not?

cheers

 

[aggis]

Worth checking the Air Pressure Switch, if fan works but doesn't operate the APS it won't go to ignition.

 

[bluesky]

Worth checking the Air Pressure Switch, if fan works but doesn't operate the APS it won't go to ignition.

hi aggis, how to check the APS?

cheers