Fault Finding; Sequence Of Events; Check List In The Event Of A Fault; Intermittent Lockout - Main Causes - Potterton Suprima 30L Installation & Service Instructions Manual

7. Fault Finding Guide

Sequence of Events

1. On start-up boiler checks that
a. The reset button is not stuck ON
b. The Live and Neutral are not swapped
c. There is no Pump Live wiring fault
d. The gas valve is not energised
e. There is no flame detected
Note: If there is a fault the Control will go to lockout
2. Control continues to hold gas valve open until either the set temperature is reached or the switch live demand is
removed
3. Pump remains energised whilst there is a demand
4. Setting control thermostat to 'O' has the same result as reaching the set temperature
5. Control checks that flame is not detected
6. Control re-starts ignition sequence

Check list in the event of a fault

1. Switched Live call for heat is recognised by the Control but as boiler control thermostat is set to 'O' the ignition
sequence is not started
2. Flashing Green indicates a call for heat to the user
3. Control thermostat set to call for heat
4. Control starts ignition sequence, Air Pressure Switch is checked for open circuit
5. Fan is energised
6. If APS fails to operate control goes to Blocking error (Red light flashes but no need to press reset). Control waits
for APS to operate before energising gas valve and starting EHT spark
7. Control checks gas valve is energised. If valve is not energised overheat thermostat may be faulty
8. Control checks for flame detection within 3 seconds, if a flame is not detected the fan is turned off and the ignition
sequence is restarted for two further attempts from '4'
Intermittent Lockout - Main causes are:
Other common reasons for complaint are:
34

Fault Finding

Supplied By www.heating spares.co Tel. 0161 620 6677
Switch Live connected to Pump Live
Poor burner ignition due to gas pressure
Poor burner ignition due to incorrect spark gap
Slow opening gas valve after a long standby period
Weak spark due to electrode lead or Control
Pre-pay gas meter running out
Other system faults (actuator, room thermostat, timer)
Lack of user education in the operation of system control
System wiring faults affecting operation or temperature
Publication No. 5102696