My Baxi Solo 50/4 Wall Mounted PF gas fired central heating boiler ignites when the thermostat calls for heat, stays alight between 30 minutes and an hour, then the burner goes out and reignites. The pilot light remains on all the time while the burner clicks on and off, lighting and going off every 5 seconds. I've changed both the PCB and the Gas Valve, and I've just given the Combustion Box and the Burner, Injector and the Pilot an annual service, (wire brush and inspection). All seem to be in fine working order. Both hot water and heating radiators are supplied and work perfectly whilst the boiler is running. The pilot light goes out after approximately 10 minutes of switching the burner on and off following 1 hour of perfect operation of the boiler. This can't be an overheat thermostat problem, as surely it would have cut out before an hour of perfect operation of the boiler. Any suggestions on how to solve this burner cutting out problem?

David C. Kerr, November 2006

all lights are not working

pat, November 2011

My boiler is poorly. it operates the hot water with no problems. When I put my heating on the burner initially burns for around 15 minutes then starts a 1 minute on - 1 minute off cycle (with no overheat light showing). If i dont turn it off at the thermostat , it will continue to do this all day.

Jules, January 2010

my baxi boiler works spot on with hot water only. but when on central heating it goes for about one hour then boiler will not fire up untill about four hours later and my house is cold . why/

richard torney, November 2009

hi i have a baxi solo im gettin hot warter but the radiators are only gettin warm have bled them but still the same and the light near to the orange knob is cutting out

dave, October 2009

will not work after power cut tried re-setting but pilot light stil out

wendy, August 2009

faulty flue

chas4gas, September 2008

Hello I have a Baxi Solo 2 pilot light will light but when you release the button it go's out ????

Stan, March 2008

Yes, the problem sounds like the feed to the air switch (black pipe) Replace this and all should be well

Tony, January 2008

Spot on, Alec. My Baxi 50 kept shutting down after 5 seconds or so, but fan kept running, etc and constant reignition. The black pipe to the air-switch was very brittle and split at both ends. Once replaced, perfect operation.

Many thanks for a great hint.

Andy K Galpin, December 2007

I've had similar trouble with my pf/4 50 wm-the boiler would run fine then the main burners would extinguish (after a few minutes)while the fan etc stayed on calling for duty.Eventually the burners would fire again,for another few minutes-purely random.
The problem was solved by renewing the polymer pipes to the pressure switch-both red and black-these get hard with time and split-and the partial leaks were enough to give partial running-the boiler ends were both ruptured on the inside of the bends-impossible to see without removing the pipes.
Boiler is now as good as new-it dates to the 90's

Alec Newton, June 2007