14.0 Electronic Gas Valve
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© Baxi Heating UK Ltd 2012
Electronic Gas Valve
The Bertelli Electronic Gas Valve (E.G.V.) has no mechanical adjustment of the gas air ratio, however it does have inlet and
burner pressure tapping points.
It is 24vDC and the connection is to the P.C.B. via the front connection. If this connection is faulty E09 will be displayed.
The EGV has two safety valves, the first is an ON/OFF solenoid and the second is used as safety but also to control the
outlet gas flow depending upon the signal from the P.C.B. This second valve also controls the outlet gas pressure.
The outputs on the connector both on the P.C.B. and E.G.V. are extremely difficult to measure with a multi-meter, so it is
advisable not to measure this signal.
Disconnecting the lead and checking the plug will result in an E09 error.
If the boiler keeps going to E133 and you have checked all components and done a re-calibration, then it is possible the gas
valve may not be fully opening upon Ignition.
Change the Valve and do a re-calibration (page 11).
Resistances for the two coils
Pins 1 + 3 = 20 – 30 Ohms
Pins 2 + 4 = 60 – 70 Ohms
Ionization Gap
The ionization electrode is unique to the GA system and it is important to maintain the correct distance from burner to the
parallel section of the electrode.
The distance should be 5mm +- 1mm. If it is out of this tolerance, the combustion may be compromised by the settings of
the E.G.V. so install a new electrode and perform a re-calibration as described on page 11.
