our csi85t is trying to fire up ,fires for 5secs and fails for 5 goes on on on then gives up is it temp sensors or air pressure switch or boiler thermostats or the setting on the wall thermostat or because our drayton digistat 3 thermostat is a optomising all singing and dancing machine (according to a senor heating technical person)and is not set correctly.please i would love to know set me free from my tormentors and grant me internal warmth jymbo
The PCB commonly fails often giving one of the following symptoms:
Fuse on PCB blown - boiler does nothing.
Pump runs but fan not running or erratic.
Pump and fan run but gas valve doesn't open (but check air pressure switch).
Pump, fan & gas valve operate but no spark ignition.
Boiler lights but shuts down after a few seconds because it doesn't detect flame (but check electrode leads and condensate trap if conncted).
PCBs are available on Ebay.
Phil T, June 2010
If you look at the book that came with the boiler look on falt finding ( is the burner on/off )It is either the fuse or the gas valve or something you cant do your self. to test the valve I pulled the wire off when it was lit, and it stayed on so that was the fault.
dennis m, January 2010
Think it might be the pcb board, i'll let you know if it cures the fault
paul holdsworth, January 2010
i have exactly the same problem but only in central heating mode, hot water ok
