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Strange boiler behavior
Posted: Wed Feb 04, 2015 9:50 pm
by juan
Hi all,
I ordered the Opentherm gateway as a kit. After assembling the kit I measured al voltages and currents and everything seems to be OK. I loaded firmare v4.2 to the PIC. Then I connected the OTGW to my Honeywell Chronotherm Vision Modulation thermostat and to my Intergas Kombi Kompakt HR 28/24 boiler. The gateway seems to work well. No errors so far but the graph shows a strange behavior of the boiler. The temperature drops to zero once in a while (see picture). I don't know if it is an error in the boiler (sensor) or in the gateway or a timing problem in the software or something else.
I searched the forum for simular problems but I can't find anything similar (so far).
Does someone knows what this behavior is caused by?
Thanks in advance.
In case the image doesn't show up here is dropbox link:
https://www.dropbox.com/s/6qgnv8jtmfcnf ... e.jpg?dl=0
Re: Strange boiler behavior
Posted: Wed Feb 04, 2015 11:56 pm
by hvxl
Just look at the logs around the time where you see a drop in the graph and you should be able to tell if it's the boiler that's reporting the value, or otmonitor interpreting something incorrectly.
Re: Strange boiler behavior
Posted: Thu Feb 05, 2015 9:05 am
by juan
Thank you Schelte for your reply. I did look at the log but I didn't yet know where to look for
I'll try that as soon as I'll be home.
Re: Strange boiler behavior
Posted: Thu Feb 05, 2015 7:02 pm
by hvxl
The figure that drops to zero is the boiler water temperature. You can click on the graph close to such a drop to get the approximate time of the occurrence. Then go to the statistics tab and select "Boiler Water Temperature". That will highlight the reports for that DataID in the log tab. Scroll the log tab to the time you found from the graph. Then look for highlighted reports from the boiler around that time (you'll first find a Read-Data request from the thermostat that always has a value of 0. That's OK). If you find a Read-Ack message with a value of 0, then the boiler is really reporting a temperature of 0. If you find something else, let me know so I can fix otmonitor.
Re: Strange boiler behavior
Posted: Sat Feb 07, 2015 3:07 pm
by juan
I finally found the time to reconnected the gateway to the CH system and when the boiler temperature in the graph dropped to zero again I looked at the log file and found the following data:
Code: Select all
13:56:16.905251 T10013900 Write-Data Control setpoint: 57.00
13:56:17.045587 BD0013900 Write-Ack Control setpoint: 57.00
13:56:17.451276 T00090000 Read-Data Remote override room setpoint: 0.00
13:56:17.459070 R00780000 Read-Data Burner operation hours: 0
13:56:18.355967 T80190000 Read-Data Boiler water temperature: 0.00
13:56:18.367223 R80190000 Read-Data Boiler water temperature: 0.00
13:56:18.465178 BC0193B00 Read-Ack Boiler water temperature: 59.00
13:56:18.473060 A40190000 Read-Ack Boiler water temperature: 0.00
13:56:18.886417 T00090000 Read-Data Remote override room setpoint: 0.00
13:56:18.897851 R007B0000 Read-Data DHW burner operation hours: 0
13:56:19.073477 B407B07FF Read-Ack DHW burner operation hours: 2047
13:56:19.080162 AC0090000 Read-Ack Remote override room setpoint: 0.00
13:56:19.432285 T80640000 Read-Data Remote override function: 00000000
13:56:19.436951 R00740000 Read-Data Burner starts: 0
What do the R and A codes at 13:56:18 mean?
Re: Strange boiler behavior
Posted: Sat Feb 07, 2015 5:52 pm
by hvxl
juan wrote:What do the R and A codes at 13:56:18 mean?
That's explained on the
web site.
This is very interesting. The request before the Boiler water temperature has been replaced by an alternative message, but the boiler doesn't provide a response on that. Then on the next message (the Boiler water temperature request) the gateway apparently still has some state left over from the previous incomplete communication. That causes it to report that it's sending a replacement message to the boiler, even though it's exactly the same as what the thermostat requested. Because it thinks it sent a replacement message, it then also clears the data value it receives from the boiler. This causes the drops you noticed in the graph.
So there's probably a bug in the gateway firmware rather than in otmonitor. I will have to investigate what exactly is going wrong and what to do about it. Thanks for reporting this. I'm glad you didn't just shrug your shoulders and ignored this occasional drop.
Re: Strange boiler behavior
Posted: Sat Feb 07, 2015 6:25 pm
by juan
Thanks for your answer Schelte.
If I can help you out by sending a log file please let me know.
Re: Strange boiler behavior
Posted: Sun Feb 08, 2015 11:16 am
by hvxl
Thanks for the offer, but that probably won't be necessary. I have been able to reproduce what you saw on the simulator. My suspicion was correct, there was some state left behind from the unanswered replacement message.
You could help me out by trying
firmware 4.2.1, which will hopefully fix the issue. Please let me know either way.
Re: Strange boiler behavior
Posted: Sun Feb 08, 2015 4:33 pm
by juan
Works like a charm now! (see picture).
or link:
https://www.dropbox.com/s/fj1e978qjf2cz ... 9.jpg?dl=0
Code: Select all
OpenTherm Gateway V4.2.1
14:41:00.114362 BC000030A Read-Ack Status: 00000011 00001010
14:41:00.519982 T10013300 Write-Data Control setpoint: 51.00
14:41:00.722626 BD0013300 Write-Ack Control setpoint: 51.00
14:41:01.065992 T00000300 Read-Data Status: 00000011 00000000
14:41:01.222066 BC000030A Read-Ack Status: 00000011 00001010
14:41:02.002019 T80190000 Read-Data Boiler water temperature: 0.00
14:41:02.126744 B40193300 Read-Ack Boiler water temperature: 51.00
14:41:02.532536 T00000300 Read-Data Status: 00000011 00000000
14:41:02.641548 BC000030A Read-Ack Status: 00000011 00001010
14:41:03.063309 T00000300 Read-Data Status: 00000011 00000000
14:41:03.250010 BC000030A Read-Ack Status: 00000011 00001010
14:41:03.609124 T00000300 Read-Data Status: 00000011 00000000
14:41:04.529059 T00000300 Read-Data Status: 00000011 00000000
14:41:04.653883 BC000030A Read-Ack Status: 00000011 00001010
14:41:05.059811 T00000300 Read-Data Status: 00000011 00000000
14:41:05.149967 BC000030A Read-Ack Status: 00000011 00001010
14:41:05.586974 T10013300 Write-Data Control setpoint: 51.00
14:41:05.766363 BD0013300 Write-Ack Control setpoint: 51.00
14:41:06.135921 T801C0000 Read-Data Return water temperature: 0.00
14:41:06.142263 R007B0000 Read-Data DHW burner operation hours: 0
14:41:06.276379 B407B07FF Read-Ack DHW burner operation hours: 2047
14:41:06.281178 A701C0000 Unk-DataId Return water temperature: 0.00
14:41:06.666479 T80190000 Read-Data Boiler water temperature: 0.00
14:41:06.775434 B40193300 Read-Ack Boiler water temperature: 51.00
Thanks for solving this problem so quickly
Re: Strange boiler behavior
Posted: Wed Feb 11, 2015 10:21 pm
by hvxl
Thanks for testing.
(Tip: Don't use jpg format for screen shots, it looks terrible. GIFs or PNGs are much more suitable)