Central Heating ON always

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Hi, I've replaced some parts because my boiler could produce hot water but no Central Heating.
I replaced the Pressure Gauge and filled up the boiler but if I turn it on..
The Burner starts at maximum and the HEATING are ON despite the control thermostat is on the OFF position.

Now I have Hot water and Heating on... but at all the TIMES.

Please Help
Burro
 
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Hi, the boiler is ALPHA 80FF style.
the Parts..
Fan Resistor,
Control Thermostat
Pressure Gauge.

I have checked the wiring but all seems OK.
I have no idea.

Cheers
Burro
 
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So if you managed to incorrectly fit a control stat then surely you could think of something else to screw up without needing to ask us.

Seeing as you did ask then you could try making a hash of fitting a new flow switch diaphragm
 
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Actually, the Thermostat was fitted following the electrical diagram given on the instruction manual.
Something I am concerned with are the wiring to the .... some of them were in the wrong plugs, but still putting them right hasn't made any change.

Slugbabydotcom
You know more than me 4Sure..
Will a new flow switch diaphragm sort out this weird problem?

Thanks anyway
Burro
 
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