Installation Manual
Gas Fire Heater – Cod. 99962NA – November 2002
14
MALFUNCTION
POSSIBLE CAUSE
REMEDY
The water heater doesn’t work
Gas and water tap opened
Power indicator ON
D. Hot Water operation indicator OFF
_
Rotative flow meter
_D. Hot Water 1/8” sensor
_Fuse
_Main Circuit Board (See table 1)
_
Replace it
_Replace it
_Replace it
_Replace it
The water heater doesn’t work
Power indicator ON
D. Hot Water operation indicator ON
_High temperature limit
thermostat
_Exhaust fan
_Electronic ignition board faulty
_Replace it
_Replace it
_Replace it
Power indicator ON
D. Hot water operation indicator ON
Exhaust fan working
but flame doesn’t ignite and the water
heater doesn’t lock-out.
_Air pressure switch
_Air intake flue pipe obstructed
_Electronic ignition board faulty
_Replace it
_Clean the flue pipe
_Replace it
Power indicator ON
D. Hot water operation indicator ON
Exhaust fan working
The flame ignites but after 10 seconds the
water heater locks out.
_Line / Neutral polarity reversed
_Ionisation electrode
_Ionisation electrode lead
_Electronic ignition board
_Reverse polarity
_Check and adjust the electrode
position
_Replace it
_Replace it
Power indicator ON
D. Hot water operation indicator ON
Exhaust fan working
The ignition electrode sparks but does not
ignite the burner and after 10 seconds the
water heater locks-out.
_Ignition electrode in bad position
_Electronic ignition board faulty
_Gas valve faulty
_insufficient fuel (gas)
_Check that the distance from the
burner is 2.5 / 3 mm
_Replace it
_Replace it
_Open the gas tap
The water heater always runs at minimum
output
_Modulator lead broken or
disconnected
_Modulator calibrated incorrectly
_Flow meter calibrated incorrectly
_Replace or connect it
_Calibrate it
_Calibrate it
ON THE MAIN PRINTED CIRCUIT BOARD CHECK THAT ON FLOW
METER TERMINAL THERE IS VOLTAGE AMONG GREEN - WHITE AND
GREEN - RED LEADS.
THE MEASUREMENTS MUST BE DONE WHILE THE WATER HEATER IS
WORKING.
FLOW METER
FAULTY
GUASTO
D.H.W. SENSOR
FAULTY
GUASTA
GREEN
P.C.B. OR FUSE
FAULTY
GREEN
GREEN
WHITE
RED
RED
WHITE
O
RED
WHITE
0 V
12 V
12 V
6 V
0 V
0 V
Table 1 MALFUNCTIONS DIAGRAM
