Servicing Manual
30
Check that there is electrical continuity
between the terminals 1 and 3 of the reset
pushbutton.
Check that there is a 18-20V voltage
between the terminals M2 and M19 of the
burner control unit when the unit is in
lock out condition (the lamp is alight).
Electrical continuity check
Unplug the heater
Turn switch to I (ON)
Set the room thermostat in a operating
(closed) position
Check that the overheat thermostat is
closed
Check electrical continuity between
terminals M3 and M4 of the electronic
control unit (with all wires connected).
Power supply to loads
Plug the heater.
Turn switch to I (ON)
Set the room thermostat in a operating
(closed) position
Using a multimeter, check that the burner
control unit is powered
Ill. 53
Check voltage on the transformer, motor
and solenoid valve terminals and that they
are correctly energized according to the
operational cycle.
Ill. 54
The voltage supply to components must match
with the mains voltage.
Should this not occur, or should the components
not be correctly energized according to the
operational cycle, replace the flame control unit
with a new one.
Lock-out test
Start the heater and wait that the ignition cycle is
completed. (wait until the ignition spark stops).
Disconnect the flame sensor fast-on from
terminal M5 on the burner control unit.
The heater must immediately lock-out.
The red warning lamp must light up.
M19
M1
M2
