Central Heating Turning Off Automatically AAARRGGGGGHHHHH

[shakeeb786]

ariston a23 mffi combi boiler
i have just replaced the diverter valve on this boiler, as the water wouldnt work but thats fine
but now when i turn on the central heating, the boiler is fine, when it waits for the pipes to cool because it is hot it dosnt come back on??
what could be the problem?

 

[hav it]

check stats first but possible pcb fault. Not a very good boiler imo.

 

[hav it]

have you checked that the water is pumping around ch correctly??

 

[bengasman]

what do you have to do to make the boiler come back on?

 

[shakeeb786]

i have to turn the central heating switch off and back on to put them back on
the pump is running continously, and working fine, all the heaters work fine but then the water goes cold and heaters go cold.
the burner wont restart when pipes go cold
ive had a thermostat replaced in the past month
hot water works
ive tried opening hot water when the heating turned off
but that dosnt make a difference

 

[shakeeb786]

i thought maybe it could be a sensor that has become faulty or a switch
the lights for the water temperature are working fine
thanks in advance

 

[shakeeb786]

i was told something about an air pressure switch???
but i dont know
also there is a sensore in the boiler connected to the diverter valve
when the wire is taken out and put back in it turns the heating on
could the sensor have become faulty?

 

[bengasman]

i have to turn the central heating switch off and back on to put them back on

is that summer/winter switch or the power to the whole boiler.

 

[shakeeb786]

There is no summer/winter switch on the boiler
the switch is just for central heating and hot water
or just hot water
i have to turn it back to just hot water then back to ch and hw for the boiler burner to restart
the pump is running continously while the central heating is on

 

[bengasman]

that is what i call the summer/winter switch.
has a very different effect from turning power off and on, which quite often acts as a reset after lock out

pump should be running all the time when heating is on, regardless of flame or not

 

[bengasman]

could be pcb, bad electrical connection, flow switch, diverter to name but a few.
time for an RGI, will be cheaper than changing your boiler part for part.

 

[hav it]

does the fan run??? or is it that the pump only runs?

 

[shakeeb786]

could be pcb, bad electrical connection, flow switch, diverter to name but a few.
time for an RGI, will be cheaper than changing your boiler part for part.

i have changed the diverter valve, and it was working fine before
what is the flow switch
and what is a RGI

also the fan and pump are both running constantly when central heating is turned on

 

[bengasman]

could be pcb, bad electrical connection, flow switch, diverter to name but a few.
time for an RGI, will be cheaper than changing your boiler part for part.

also the fan and pump are both running constantly when central heating is turned on

for how long?
flame or no flame?

 

[hav it]

if you had called an rgi it would be working now.