vokera compact 24 red light keeps comimg on

[gas57]

anybody help i have a vokera compact 24 red light keeps coming on i have changed both thermistors and pressure is at 1 bar i reset it and it runs for abit then goes to red again any help i am gas safe registered

 

[fixter1]

check sensing & spark electrode is it still sparking when burner is lit ?????

 

[gas57]

no stops sparking when lit boiler runs fine then when it gets warm red light comes and boiler wont work till you reset it

 

[Billy Bob Bob]

sounds like its overheating

 

[gas57]

gas man its funny you should say that when i changed both thermisters i had my dinner on job and it run fine on and off for 1/2 hour so i put casin on went to my next job 15 mins later got call boiler red light on again do you think it could be high limit stat thats failing