MAINTENANCE
34 TECHNICAL DOCUMENTATION
REMOVAL OF GAS VALVE AND VENTURI
• Isolate the gas and electrical supplies to the boiler.
• Remove the four bolts from the elbow flange on the rear of the gas valve ( ).
• Remove the electrical connection on the gas valve.
• Remove the three bolts (ETHOS 70 - 110) or the six screws (ETHOS 130) from the venturi / fan ( ).
• Remove the gas valve / venturi assembly from the boiler.
• To separate the gas valve and venturi, remove the four bolts on the assembly ( ).
• Replace in reverse order ensuring all seals / gaskets are in good condition (renew if necessary).
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