I have a Potterton Netaheat Electronic boiler that doesn`t always ignite when the thermostat (Drayton Digistat) triggers the heating to come on. The wireless thermostats are showing that the heating system is on. What is the likely cause? The programmer is SALUS EP100/200.

M. Roberts, November 2006

the flame might show on the digistat but is the green light illuminated on the receiver unit? if its not try resetting the stat to the instructions. I have found though that the remote stats are quite prone to failure.

Paul, November 2006

Difficult to tell without being there.
You will have to test that power is getting through to the switched live terminal on the boiler.
If not then it's one of the two control,or it could be your 3way valve.
Only way to find out is by process of elimination.
Sorry can't be of more help.
Pete 100%Heating Bristol.

Peter Brown, November 2006