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Mend Saunier Duval Home Heating Systems

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How can I fix no hot water saunier duval 620sd?

I have saunier duval 620 . I change diaparam the centralheating working ok but no hot water the pressure . motor . fan everthing ok but no hot water!

roger
March 2007
Saunier DuvalHeating, Home Heating SystemsWater Saunier Duval
The facts are not clear.
How much water pressure.
Does the reversing valve turn over to hot water, if not the diaphragm. is at fault it does then it will either be the thermistor ( orange), or the micro-switch.
If the heating is running when the tap is turned on and the burners go out the thermistor is at fault.
One important thing. Was the governor still in the water valve

alan
March 2007

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