I’m running an old Gloworm back boiler which has operated without fault for the last 3 years (since I moved in to this house), the control unit used was a Landis and Gyr RWB2 which has a sliding on off switch for both CH and HW accompanied by a large rotating timer (which never worked, I just used to manually switch it on every day).
Recently so spruce the controls up I managed to get hold of a Siemens RWB9, which has an identical backing plate and wiring. I read the instructions, set the slides on the rear to programme ‘16’ which is pumped rather than gravity fed, and pushed the reset button as instructed.
At the same time I replaced the thermostat to a newer looking Honeywell unit.
The new control unit now lights up and you can hear and see it switching on for both CH and HW but on the CH setting it’s not telling the boiler or water pump to come on. HW is working fine. I have reread the instructions and found nothing which identifies why the CH is not working.
I’ve put an electric meter to the water pump to see if it’s getting power as I thought it might have packed up, but there is no power going to it.
Following this I put back the old Landis and Gyr control unit to see if the central heating would come back on. The result was no CH but only HW as per the new control unit.
Has any one got any ideas as to what to look at next?
Any advice would be welcome.
Many thanks.
Recently so spruce the controls up I managed to get hold of a Siemens RWB9, which has an identical backing plate and wiring. I read the instructions, set the slides on the rear to programme ‘16’ which is pumped rather than gravity fed, and pushed the reset button as instructed.
At the same time I replaced the thermostat to a newer looking Honeywell unit.
The new control unit now lights up and you can hear and see it switching on for both CH and HW but on the CH setting it’s not telling the boiler or water pump to come on. HW is working fine. I have reread the instructions and found nothing which identifies why the CH is not working.
I’ve put an electric meter to the water pump to see if it’s getting power as I thought it might have packed up, but there is no power going to it.
Following this I put back the old Landis and Gyr control unit to see if the central heating would come back on. The result was no CH but only HW as per the new control unit.
Has any one got any ideas as to what to look at next?
Any advice would be welcome.
Many thanks.