Thermostat doesn't switch on
Posted: Sat May 04, 2019 10:25 pm
Hi everyone,
I recently moved house and took my (previously working) OTGW with me. I bought this from Kiwi electronics in 2017 and it worked fine previously. Now, I'd like to connect it in the new house and I can't seem to get it to work. I have a Bosch HRE 35 boiler and an (old version) Honeywell Round thermostat (T87M1003). When I connect the thermostat directly to the boiler everything is fine. I checked the voltage to the thermostat and it looks like it's about 31 V when the thermostat isn't connected, and 6 when it is, so that seems correct. When I connect the thermostat, on the serial bus, I see a "Thermostat connected" message and after that I get "T80190000" every second. If I remove the thermostat that's reported as well. So everything seems pretty normal (although I'd also expect some other messages than T80190000).
The problem is that the thermostat doesn't switch on (at least: there's nothing on the display and I don't see any messages after turning the knob). It works when it's connected to the boiler directly, but never when connected to the OTGW. I've pretty much tried everything I could think of, but I'm probably missing something. I tried connecting it to the OTGW with very short leads (guessing the OTGW may not be able to get the power to the other side of the long leads as well as the boiler) but that didn't help. I thought I may have a broken cable, but that's not it (I connected it with some splice clamps in place of the OTGW and the thermostat works just fine).
Is there some command I need to send to the OTGW to get the thermostat to work or am I doing something else wrong?
I recently moved house and took my (previously working) OTGW with me. I bought this from Kiwi electronics in 2017 and it worked fine previously. Now, I'd like to connect it in the new house and I can't seem to get it to work. I have a Bosch HRE 35 boiler and an (old version) Honeywell Round thermostat (T87M1003). When I connect the thermostat directly to the boiler everything is fine. I checked the voltage to the thermostat and it looks like it's about 31 V when the thermostat isn't connected, and 6 when it is, so that seems correct. When I connect the thermostat, on the serial bus, I see a "Thermostat connected" message and after that I get "T80190000" every second. If I remove the thermostat that's reported as well. So everything seems pretty normal (although I'd also expect some other messages than T80190000).
The problem is that the thermostat doesn't switch on (at least: there's nothing on the display and I don't see any messages after turning the knob). It works when it's connected to the boiler directly, but never when connected to the OTGW. I've pretty much tried everything I could think of, but I'm probably missing something. I tried connecting it to the OTGW with very short leads (guessing the OTGW may not be able to get the power to the other side of the long leads as well as the boiler) but that didn't help. I thought I may have a broken cable, but that's not it (I connected it with some splice clamps in place of the OTGW and the thermostat works just fine).
Is there some command I need to send to the OTGW to get the thermostat to work or am I doing something else wrong?