Gav_P Posted September 27, 2018 Author Share Posted September 27, 2018 ? done! Link to comment Share on other sites More sharing options...
Gav_P Posted September 27, 2018 Author Share Posted September 27, 2018 I think this would be a suitable replacement: https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F283148597323 but it seems to be an older version, not sure if that’s an issue? Link to comment Share on other sites More sharing options...
Triassic Posted October 3, 2018 Share Posted October 3, 2018 @Gav_P Did you manage to get the board working. @joe90 has a similar problem and would be interested to know how your progressing. Link to comment Share on other sites More sharing options...
Gav_P Posted October 3, 2018 Author Share Posted October 3, 2018 @Triassic @joe90 I’ve ordered a replacement GMC board. It should be arriving beginning of next week, so i’ll Let you know how it goes. 1 Link to comment Share on other sites More sharing options...
Gav_P Posted October 22, 2018 Author Share Posted October 22, 2018 So after being away for a week I was hoping my new GMC board had been delivered. Unfortunately no such luck. I have raised it with the seller and they are trying to track it down at the moment. But as a note of warning @joe90; their communication is very poor. It’s taken 3 messages to get a response. You may want to consider this if you haven’t ordered one already. Link to comment Share on other sites More sharing options...
joe90 Posted October 24, 2018 Share Posted October 24, 2018 Thanks Gav, yup I have ordered mine from the Netherlands, apart from finding it difficult to arrange a foreign money transfer their communication was good, it will take a couple of weeks to arrive and will report how I get on. 1 Link to comment Share on other sites More sharing options...
Gav_P Posted October 24, 2018 Author Share Posted October 24, 2018 Fingers crossed! 1 Link to comment Share on other sites More sharing options...
Gav_P Posted October 29, 2018 Author Share Posted October 29, 2018 (edited) I’ve just been wondering if there is a way to jury rig the ASHP to run without the GMC board. My theory is that there is very little interaction between the GMC board and the other main controller board (can’t remember off the top of my head what it’s called). The GMC seems to predominately just connect sensors. This would confirm that it’s the GMC in both mine and @joe90 is the problem component. Edited October 29, 2018 by Gav_P Link to comment Share on other sites More sharing options...
PeterW Posted October 29, 2018 Share Posted October 29, 2018 54 minutes ago, Gav_P said: I’ve just been wondering if there is a way to jury rig the ASHP to run without the GMC board. My theory is that there is very little interaction between the GMC board and the other main controller board (can’t remember off the top of my head what it’s called). The GMC seems to predominately just connect sensors. This would confirm that it’s the GMC in both mine and @joe90 is the problem component. Unlikely - if it’s the same as a lot of control systems there will be a heartbeat between the main processor and any daughter boards to ensure that signals are correctly interpreted. You would need to know how to spoof this signal or the whole lot will throw an error. Link to comment Share on other sites More sharing options...
Gav_P Posted October 29, 2018 Author Share Posted October 29, 2018 21 minutes ago, PeterW said: Unlikely - if it’s the same as a lot of control systems there will be a heartbeat between the main processor and any daughter boards to ensure that signals are correctly interpreted. You would need to know how to spoof this signal or the whole lot will throw an error. Yeah but I was wondering if was more of a go / no go kind of signal. There seems to be just earth, live, neutral and a second “live” between the boards. But TBH I am just poking about by torch light. I wondered if something like the flow switch (that’s connected to the GMC) was the trigger to tell the inverter board to turn on. Link to comment Share on other sites More sharing options...
Jeremy Harris Posted October 30, 2018 Share Posted October 30, 2018 That board stores all the setting parameters needed to allow the ASHP to function. When a new board is fitted a command unit needs to be connected to download all the setting parameters I believe. I know that if the command unit is disconnected after the main board has been programmed all the set parameters will remain stored in non-volatile memory and the ASHP will function normally (as long as the dry contact control option has been set). Kingspan programmed their version of the Carrier like this, with preset parameters loaded at the factory, and they then shipped ASHPs without a command unit, at least for some models. Link to comment Share on other sites More sharing options...
ProDave Posted October 30, 2018 Share Posted October 30, 2018 @Gav_P Your board arrived this morning. I am glad you sent the complete assembly including the transformer. First finding, there was no output from the transformer. Primary winding appears open circuit. Step 2 try powering the board from a bench power supply fed into the transformer input. As this feeds into a bridge rectifier, the polarity from the bench supply should not matter. The board powers up and the LED is flashing away. giving 4 flashes, a pause then 1 flash. No doubt a fault code as just about everything is unplugged. It looks like the overload on the power supply due to the short circuit caused the thermal protection in the transformer to blow. It may or not be possible to repair the transformer, it might need a new one. I will keep you posted. 1 Link to comment Share on other sites More sharing options...
Jeremy Harris Posted October 30, 2018 Share Posted October 30, 2018 These are the GMC fault codes: Sounds like good news, @ProDave. As it's giving fault codes it suggests to me that the board is alive and working and only the 12 V supply got shorted. Fingers crossed that replacing the bridge rectifier and fixing/replacing the 12 V transformer fixes it. With luck it will still have retained the settings in the non-volatile memory, too. 1 Link to comment Share on other sites More sharing options...
PeterW Posted October 30, 2018 Share Posted October 30, 2018 Sounds like an error 14 which would indicate that the board can’t see the inverter board which does indicate a heartbeat. @ProDave - is this a pretty standard 12v transformer that could be either removed or bridged ..?? 1 Link to comment Share on other sites More sharing options...
ProDave Posted October 30, 2018 Share Posted October 30, 2018 Yes it's a standard chassis mount 240V ac in 12V ac output 667mA transformer needed. The 2 mounting holes are 60mm apart. I am trying a bit of careful disection to see if I can see a thermal trip but initial thought is if there is one it won't be accessible so will be looking for a new transformer. I have to go out just now so back later to continue the search. Link to comment Share on other sites More sharing options...
Gav_P Posted October 30, 2018 Author Share Posted October 30, 2018 @ProDave that’s a great start!! Brilliant! Link to comment Share on other sites More sharing options...
Gav_P Posted October 30, 2018 Author Share Posted October 30, 2018 I’m also very pleased that the new GMC board didn’t arrive and I got a refund! ? Assuming that it’s as it first appears and the board is ok. fingers crossed ? Link to comment Share on other sites More sharing options...
Gav_P Posted October 30, 2018 Author Share Posted October 30, 2018 @joe90 have you checked your 12v feed from the transformer? Link to comment Share on other sites More sharing options...
Onoff Posted October 30, 2018 Share Posted October 30, 2018 (edited) 48 minutes ago, ProDave said: Yes it's a standard chassis mount 240V ac in 12V ac output 667mA transformer needed. The 2 mounting holes are 60mm apart. I am trying a bit of careful disection to see if I can see a thermal trip but initial thought is if there is one it won't be accessible so will be looking for a new transformer. I have to go out just now so back later to continue the search. Is that 60mm to the centres or are they slots and its say 55 +/- ? Some cheapies here. Ive used the company ESR before as has @Nickfromwales I think: https://www.esr.co.uk/electronics/transformer-chassis.htm Edited October 30, 2018 by Onoff Link to comment Share on other sites More sharing options...
ProDave Posted October 30, 2018 Share Posted October 30, 2018 Okay this is the closest I can find https://cpc.farnell.com/camdenboss/ctfc12-12/transformer-12va-2-x-12v/dp/TF01339?st=12v transformer you can get that from any number of suppliers but they are all the same size. This is a little bigger than the original. I don't think mounting it on the back of the plastic tray moulding will be a problem, BUT it will stick out 10mm further than the original transformer. Can someone with sight of how the plastic tray fits into the unit tell me if an extra 10mm clearance for the transformer is available? EDIT: Just taking a look at the link above that may be more suitable Link to comment Share on other sites More sharing options...
Onoff Posted October 30, 2018 Share Posted October 30, 2018 12 minutes ago, ProDave said: Okay this is the closest I can find https://cpc.farnell.com/camdenboss/ctfc12-12/transformer-12va-2-x-12v/dp/TF01339?st=12v transformer you can get that from any number of suppliers but they are all the same size. This is a little bigger than the original. I don't think mounting it on the back of the plastic tray moulding will be a problem, BUT it will stick out 10mm further than the original transformer. Can someone with sight of how the plastic tray fits into the unit tell me if an extra 10mm clearance for the transformer is available? EDIT: Just taking a look at the link above that may be more suitable 312-112 on the ESR link? Link to comment Share on other sites More sharing options...
joe90 Posted October 30, 2018 Share Posted October 30, 2018 Hooray, my new board has arrived. BEWARE, IT HAS A STATIC DEVISE NOTICE, ONLY HANDLE ON A STATIC SAFE WORKSTATION. I will earth myself before unwrapping it and installing it. I will check the 12volt supply. Currently shifting building materials around site so will attempt to fit/check 12v ASAP and will report back. 1 Link to comment Share on other sites More sharing options...
Gav_P Posted October 30, 2018 Author Share Posted October 30, 2018 There appears to be a bit of space behind the plastic tray location before it would come in contact with any of the pipe work so 10mm should be fine. Link to comment Share on other sites More sharing options...
ProDave Posted October 30, 2018 Share Posted October 30, 2018 1 hour ago, Onoff said: 312-112 on the ESR link? That is still larger than the original. The original is a bit of an odd ball, it appears to have a rating of about 8Va but in the same size package of a 6Va transformer. I don't want to fit a 6VA so the standard 12VA sizes look the best bet. Now I have confirmation there is space for a slightly bigger one, I will order the CPC one, so much simpler as I have an account with them. 1 Link to comment Share on other sites More sharing options...
joe90 Posted November 1, 2018 Share Posted November 1, 2018 (edited) .........Stop press........., now it’s stopped raining I have looked at mine and I am getting about 14v ac from my 12v transformer. (So that’s not blown, ) phew. I have replaced the board and.............my little led is flashing as it should ?and no error codes on the command unit. I am going to review the wiring and confirm it’s all ok then try it out. Here’s hoping. ? what do do you think of my high tech earth strap??? Edited November 1, 2018 by joe90 1 Link to comment Share on other sites More sharing options...
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