Fault Finding - IDEAL Response FF80 Installation And Servicing

79 FAULT FINDING MAIN MENU
Does the boiler provide HW ?
Does the boiler provide CH ?
Is the 'low system pressure' neon lit ?
Does the fan run correctly ?
Is there power to PCB 37 ?
Can the correct burner pressure be
measured during an ignition attempt (i.e.
when PCB 37 LED2 goes OFF briefly) ?
Correct
Has the gas line been purged of air ?
Is there a spark at the ignition
electrodes during an ignition attempt ?
Does the boiler light ?
The correct sequence of operation during ignition is as follows:-
1. Mains to boiler with water pressure switch and overheat thermostat closed.
2. a. Hot water tap turned on (HW and Fan lights come on) - the flow switch signals this to PCB 38, which starts the fan at full
speed and sends power to Ignition Control PCB 37 via the casing pressure switch.
or b. Clock, heating switch and room thermostat call for heat (CH and Fan lights come on) - PCB 38 senses this, starts the fan at
full speed and sends power to the pump and Ignition Control PCB 37, via the casing pressure switch.
or c. Both the above call for heat (HW and Fan lights come on) - HW takes priority, i.e. pump OFF, fan running at full speed,
power to PCB 37.
3. If the casing pressure switch is closed and the fuse on PCB 37 is OK, the 'power' and 'lockout' LEDs PCB 37 illuminate.
4. After 8 seconds pre-purge time 'lockout' LED 2 goes OFF, the spark starts and the gas valve opens.
5. If a flame is detected the spark stops, 'lockout' LED stays OFF and the 'Burner on' neon lights - the fan speed and gas rate
then adjust as dictated by boiler water temperature.
6. If a flame is not detected the spark stops, the gas valve closes, the fan continues to run and 'lockout' LED comes ON.
Foot Note: Presence of Live supply on a terminal may be checked with a multimeter set to the appropriate AC range (apply the
other probe of the meter to mains neutral, e.g. on terminal N of the programmer terminal strip).
Response FF80
- Installation
NO
NO
NO
YES
YES
No pressure
wrong pressure
pressure
YES
YES
YES but only
YES
EXIT
START THE BOILER FROM COLD
PCB = Printed Circuit Board
YES
Does the boiler provide CH ?
YES
Go to Frame 81
YES
Go to Frame 87
NO
Go to Frame 82
NO
Go to Frame 83
Go to Frame 84
or
NO
Purge gas line
NO
Go to Frame 85
NO
Go to Frame 86
briefly
Note. Switching the boiler on/off switch 'off'
when a frost thermostat is wired directly from
the mains may leave a live feed to the boiler.

FAULT FINDING

NO
Go to Frame 80
49