Boiler in short loop. 1 minute from off to call for heat

[cocjh1]

Hi,

My boiler is in a tight loop between off and calling for heat. Tonight I sat next to it and took the following measurement for Call (when the ignition starts to spark trying to light the pilot), On (when the main burner ignites) and Off (when the main burner goes out).



From these times I was able to calculate a time between Off and Call. The other time like sparking duration and lit duration were just for fun!

The average time between Off and Call is just over one minute. I believe this is very short. What would be a more realistic time for this be? I changed the pump setting from 1 to 2, during my measurements which resulted in a few seconds increase in boiler off time.

House is 4 bed detached. Boiler is Glowworm Ultimate 70FF. All rads are on and very hot.

What could be wrong please? Thermostat in boiler?

Thanks,
Chris

 

[Gas2Air]

Heat Exchanger, age of boiler, how old is the pump? System design? Are you single and nothing else to do?

 

[twgas]

Heat Exchanger, age of boiler, how old is the pump? System design? Are you single and nothing else to do?

or married and nothing else to do

 

[CBF]

& for that size house & boiler i'd be running the pump on 3