low fire hot water only ?

[aladin]

hi all
glow worm compact 105E
central heating fine high fire away it goes
turn on hot water low fire and stays at low fire . prevous gsr fitted heat exchanger, over heat stat. both (small) diverters working i tried g/worm tech took 40 mins to get through no help at all HELP

 

[REDSAW]

perhaps the venturi is blocked, whats the flow rate like?.

 

[kingdomfrank]

Hi there, I had this problem on a compact 100e a few weeks ago and it turned out to be the pcb.

 

[aladin]

thanks guys
the flow rate was good ill go with the pcb