J
JWTMoore
Hi,
I have a Camray 15/21 external boiler run by the traditional Sundial Y Plan system. All has run well for years but recently I have had a few problems. The boiler has had a new riello burner fitted and also a new boiler thermostat. I have replaced the programmer with a Honeywell ST9400A programmer and also replaced the motor in the Honeywell V4073A motorised valve. I found that the water heating has worked well but that the central heating did not always come on. I found that tif I removed the Cylinder thermostat the heating did come on. I thought it must be a faulty stat so have also replaced that. However the same thing is happening. ie. the heating is erratic coming on when I remove the cylinder stat.
Any ideas??
I have a Camray 15/21 external boiler run by the traditional Sundial Y Plan system. All has run well for years but recently I have had a few problems. The boiler has had a new riello burner fitted and also a new boiler thermostat. I have replaced the programmer with a Honeywell ST9400A programmer and also replaced the motor in the Honeywell V4073A motorised valve. I found that the water heating has worked well but that the central heating did not always come on. I found that tif I removed the Cylinder thermostat the heating did come on. I thought it must be a faulty stat so have also replaced that. However the same thing is happening. ie. the heating is erratic coming on when I remove the cylinder stat.
Any ideas??
