IDEAL Logic HEAT 12 Installation And Servicing page 56

78 NO Ch OpERaTION
Is the mode knob in the ON position?
Are the Timer and the Room Thermostat switched on?
Are the Radiator Valves Open?
Is there 230Vac at (A)?
yES
Check wiring from
terminal strip to PCB.
79 NO DhW
Is the mode knob in the ON position?
Are the Timer and the Cylinder Thermostat switched on?
Is there 230Vac at (A)?
yES
Check wiring from
terminal strip to PCB.
80 NO DIspLay
Is there 230Vac to the boiler at L and N?
Is the wiring from the terminal block to the Main PCB
connected securely?
Is the ribbon cable from the main PCB to the User
Interface PCB connected securely?
yES
Is ribbon cable
damaged?
yES
Replace ribbon
Replace User
cable
Interface PCB
56
Fault Finding
yES
yES
yES
NO
There is no Voltage from the Timer/Room
Stat. This is not boiler fault. Ensure
Voltage is supplied to boiler by rectifying
external wiring.
yES
yES
NO
There is no Voltage from the Timer/Cylinder
Stat. This is not boiler fault. Ensure Voltage is
supplied to boiler by rectifying external wiring.
yES
yES
NO
Connect ribbon from main PCB
to User Interface PCB securely
NO
NO
Move the mode knob to the ON position
NO
Switch the Timer and Room Thermostat On
NO
Open the Radiator Valves
NO
Move the mode knob to the ON position
NO
Switch the Timer and Cylinder Thermostat On
NO
Supply power to the boiler
NO
Connect the wiring from the terminal block to the
Main PCB securely.
L
N
Ideal Logic Heat -
a
a
Installation and Servicing