Glowworm 100ff confirm my ideas please

[Rob Foster]

Glowworm 100ff wall hung 30kw conventional boiler. Set up in garage with correct 28mm runs to rest of system. All worked well over the years odd new bits and bobs. Recently serviced It goes through start up sequence fine style.
Call on from timer in house, fan starts, pump on, starts ignition sequence spark ignites pilot gas - pilot established and bingo ...............28mm out starts to heat up but after about 10 mins ------------------------- shut down. Cool down and will do it all again. All rads (12 rads) are open and 3 way for cylinder is always open. Rads start to heat up. So whats the problem ? I think maybe pump is lala despite being new 3 years ago and runs smoothly. No airlocks centralheating water out of bleeds on all 3 levels of the gaff. The only control for heat is on the boiler and set at 3/4 full heat. Any ideas. It does not get to modulation in 10 mins - house is too big
Thanks in anticipation

 

[Harvest Fields]

Start by making sure the pump is spinning mate. Take the centre out and see if you can stop it with a screw driver.

 

[Last Plumber]

Glowworm 100ff wall hung 30kw conventional boiler. Set up in garage with correct 28mm runs to rest of system. All worked well over the years odd new bits and bobs. Recently serviced It goes through start up sequence fine style.
Call on from timer in house, fan starts, pump on, starts ignition sequence spark ignites pilot gas - pilot established and bingo ....28mm out starts to heat up but after about 10 mins ------------------------- shut down. Cool down and will do it all again. All rads (12 rads) are open and 3 way for cylinder is always open. Rads start to heat up. So whats the problem ? I think maybe pump is lala despite being new 3 years ago and runs smoothly. No airlocks centralheating water out of bleeds on all 3 levels of the gaff. The only control for heat is on the boiler and set at 3/4 full heat. Any ideas. It does not get to modulation in 10 mins - house is too big
Thanks in anticipation

What are the flow and return temperatures over the ten minute period?

 

[Rob Foster]

What are the flow and return temperatures over the ten minute period?

gt no accurate temps but I can touch the rtn for ever but the flow gets hot quicktime. Thank you for responding

 

[Sharp Point]

What make n model of pump is it rob?

 

[Rob Foster]

What make n model of pump is it rob?

Grunfos selectric set on speed 2 which I am pretty sure was brand new when fitted not one from out of one of the vans !

 

[Harvest Fields]

Grunfos selectric set on speed 2 which I am pretty sure was brand new when fitted not one from out of one of the vans !

Could be 6 months old, but if you system water is c**p it makes no difference

 

[Rob Foster]

Could be 6 months old, but if you system water is c**p it makes no difference

I have had the best magnet cleaner installed for the last 6 years - it was designed by me and produced by Eclipse Magnetics in Sheffield.

 

[Rob Foster]

some of the pre production units still in my workshop like the one installed on my system - cant recall what the commercial name for the eclipse unit is called nowadays

 

[Harvest Fields]

I have had the best magnet cleaner installed for the last 6 years - it was designed by me and produced by Eclipse Magnetics in Sheffield.

Nothing like blowing ones own trumpet, A Rob?