Yes
Replace the wiring from the Primary
PCB to the User Interface PCB
93
NO CONNECTION TO pRIMARy pCB
94
NO Ch BUT DhW OK
Is the above screen shown?
Check the wiring from the Primary PCB to the User
interface PCB is securely connected at both ends
Are the Timer and Room Thermostat calling for Heat?
Turn power Off and On, does the fault disappear
Are the Radiator Valves open?
Is an Ideal Electronic Programmable Room Stat
connected?
Is there 230Vac at (A)?
Is there 230V between pins 2 and 3 at the diverter
valve?
Replace Diverter Valve
No
No
No
Yes
No
No
Yes
Yes
Yes
Yes
No
Yes
Yes
Turn Central Heating Dial Clockwise
Ensure that the Timer and Room
Thermostat are calling for heat
Open the Radiator Valves
Consult Electronic Programmable Room
Stat Fault Finding Instructions
There is no voltage from the Timer/Room
Stat. This is not a boiler fault. Ensure
voltage is supplied to the boiler by
correcting external wiring
Replace Main PCB