lost OT communication after restart

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Moderator: hvxl

lost OT communication after restart

Postby Philip_Inc » Fri Oct 12, 2018 8:41 am

I use OTG in stand-alone working mode. Without thermostat with boiler of Thermona.
Everything worked well for a few months but few days ago after some hours of work or after power outage OTG stops communication with boiler. The same with GW=R command.
Code: Select all
10:17:35.314614   OpenTherm Gateway 4.2.5
10:17:35.400497   Command: SC=10:17/5
10:17:35.470303   Command: SR=21:10,12
10:17:35.495786   Command: SR=22:7,226
10:17:35.520152   Thermostat disconnected
10:17:35.556328   SC: 10:17/5
10:17:35.569668   SR: 21:10/12
10:17:35.592700   SR: 22:7/226
10:17:36.253090   R00000000   Read-Data    Status: 00000000 00000000
10:17:37.269427   R00000000   Read-Data    Status: 00000000 00000000
10:17:38.284816   R00000000   Read-Data    Status: 00000000 00000000
10:17:43.661204   R00000000   Read-Data    Status: 00000000 00000000
10:18:00.000881   Command: SC=10:18/5
10:18:00.161051   SC: 10:18/5
10:19:00.001411   Command: SC=10:19/5
10:19:00.214855   SC: 10:19/5
10:20:00.000968   Command: SC=10:20/5
10:20:00.150603   SC: 10:20/5


The only thing which helps is placing a wire on X1 interface and it starts works well for a few hours.

I already tried to reflash PIC, but nothing changed. I have very strange test results with diagnosis firmware:
Code: Select all
Opentherm gateway diagnostics - Version 1.1

1. LED test
2. Bit timing thermostat
3. Bit timing boiler
4. Delay symmetry
5. Voltage levels
6. Idle times

Enter test number: 3
4403.
3910.
4583.

Opentherm gateway diagnostics - Version 1.1

1. LED test
2. Bit timing thermostat
3. Bit timing boiler
4. Delay symmetry
5. Voltage levels
6. Idle times

Enter test number: 5
Thermostat: 2.43, 2.50
Boiler: 2.56
Reference: 1.22

Opentherm gateway diagnostics - Version 1.1

1. LED test
2. Bit timing thermostat
3. Bit timing boiler
4. Delay symmetry
5. Voltage levels
6. Idle times

Enter test number: 6

Opentherm gateway diagnostics - Version 1.1

1. LED test
2. Bit timing thermostat
3. Bit timing boiler
4. Delay symmetry
5. Voltage levels
6. Idle times

Enter test number: 6
B: 9223.107
T: 14326.677
B: 19429.080


Please be noted that there is nothing connected to X1.
Philip_Inc
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Posts: 4
Joined: November 2015

Re: lost OT communication after restart

Postby hvxl » Wed Oct 17, 2018 8:26 pm

You are running diagnostic tests that are intended to be executed with a thermostat and boiler connected, without a thermostat. Then you shouldn't be surprised that you get meaningless results.

I'm not sure why the OTGW stops sending messages to the boiler, but in the log you provided it never received (or recognized) any response from the boiler for the ones it did send. So there's some problem there.

If you put a wire across X1, the OTGW will instruct the boiler to start heating. That's not a situation you would normally want for a few hours.
Schelte
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Re: lost OT communication after restart

Postby Philip_Inc » Thu Oct 18, 2018 2:30 am

The boiler stops answer without any reason, the OTGW stops sending without any reason. But closing of X1 they start normal communication.
I need to understand what to replace: OTWG or boiler PCB.
Philip_Inc
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Posts: 4
Joined: November 2015

Re: lost OT communication after restart

Postby hvxl » Thu Oct 18, 2018 8:22 pm

If you suspect hardware issues with the OTGW, I suggest you go through the troubleshooting procedure.
Schelte
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