Set Appliance State:

CH Demand
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Turn the boiler thermostat in a clockwise direction and observe the neon lights.
Choose from below the light sequence observed.
1. NO LIGHTS DISPLAYED
2. BOILER ON AND PILOT ON ILLUMINATED
3. OVERHEAT NEON AND BOILER ON ONLY ILLUMINATED
4. OVERHEAT ONLY ILLUMINATED
5. BOILER ON ONLY ILLUMINATED
6. BOILER ON AND FAN ON ONLY ILLUMINATED
7. BOILER ON, FAN ON AND PILOT ON ILLUMINATED

8. BOILER ON, FAN ON, PILOT ON AND BURNER ON ILLUMINATED
9. RETURN TO STEP BY STEP DIAGNOSTICS