Test the ignition system safety shutoff as follows:
1. Disconnect the boiler from the mains power supply.
2. Remove the grey plug/connector from the main gas valve (it is held on with a central screw).
3. Re-connect the boiler to the mains power supply.
4. With the main gas cock (inlet manual gas valve) open, the burner should be cycled on. After all
the safety limits such as gas pressure and temperature are satised, the blower will run and
pre-purge the boiler.
5. Once the purge is complete (5 seconds), the ignition transformer will be energised. There will be
a 4 second trial for ignition period.
6. The main gas valve will not open because there is no power to the valve due to the
disconnected wires. Hence, no ame will be established and the ame safeguard will not
receive a ame signal from the ionisation probe.
7. After 4 seconds, the ame safeguard programmer will assume a “Flame Failure” condition and
limits the boiler. Limiter will not require manual reset of the ame safeguard. The control will
allow three retries before limiting.
8. After completing this test, turn off the boiler and reconnect the plug to the main gas valve,
ensuring the boiler is disconnected from the mains power supply prior to reconnecting the gas
valve plug.
3.5
TEST OF IGNTION SAFETY SYSTEM
3.6
PERFORM TEST OF LOW GAS PRESSURE SWITCH
Test the low gas pressure switch as follows:
1. Turn off the gas cock, then start the boiler until a limiter is annunciated- Error code: E76.
2. Re-open the gas cock, restart the boiler.
H
Fire the boiler and test the condensate pressure switch as follows:
1. Remove the cover plate from the switch. At high re turn the adjustment on the switch counter
clockwise (reducing the switch set-point to below the 9 mbar factory setting) until the boiler
shuts down. Error code: E77.
2. Reset the switch to the factory setting of 9 mbar.
3.7
TEST OF CONDENSATE PRESSURE SWITCH
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