Brivis Fault Code Manual

Hi All,
I am hoping someone more DIY than I can help me out.
I have a Brivis He20e gas ducted heater and all has been fine for a long time. Last Friday- it was working well then It went off and I had a largish plume of smoke and an electrical smell in the house. Turned it off. Called a technician. Found to be the large capacitor nearest to the main fan, relpaced it - all working again. That was until I turned it off around 9:30pm that night. Technician tells me that my unit hasn't got a lot of life left in it and that I should look to replace it...a little surprising to me given there seems to be many spare parts that are still available ( I do see that some parts, including the NG-1/LO Module 503 is obsolete and not manufactured any longer)
Saturday morning (02/05) - turned it on -all good. Started as is normal even pumped the heated air into the house for 15 minutes. Then an error message: 'Busy 40 H1 and 43 H1' on the networker screen.
Outside
I headed to the unit and I hear the main fan on like its all running correctly. On the controller in the unit:
Error flash and message - 'OHeat_R-A' then 'Postpurge'
So it seems to me that the unit overheats and switches to of and goes into post purge.
I switch off the power, leave it for 30 minutes, re-power it up. Worked again for 15 mins then same error messages on the networker screen and the NG-1/Lo.
Can anyone please advise if I need to totally replace the whole unit now? It seems like it could be just one small failing potentially replaceable part?
Keen for all feedback
thanks in advance

† Brivis StarPro Max/Plus, B-Max & Compact Plus models will display a ‘busy’ code at the top of the Brivis Networker display during these ignition re-attempts and if the heater locks out, a spanner will appear. Refer to section on coded messages (Page 9). Reset may need to. View and Download Brivis BX3 service manual online. Buffalo Gas Ducted Heater. Wiring Colour Code. 0000) Supply frequency.

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We have Brivis ducted gas heating. Not sure of the model number, but it was installed in Feb 2007 and the Owner's Manual is dated June 2006. We have had a few error codes on the networker over the years, and have been grateful for tips on forums like this. One day before the shortest day of the year, we awoke to a freezing Canberra morning and turned on our heater manually. The networker froze, and we seemed to have error code 59#, which is not mentioned in the Owner's Manual.

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After we pushed a lot of buttons on the networker, including various combinations and long presses, inspired by a post in this forum on a related but different problem, we gently took the networker off the wall, to disconnect it from its power supply. We replaced it about 2 minutes later, but it didn't fix the problem. Took it off the wall again (by gently twisting it upwards from the bottom), and left it disconnected for over 5 minutes. When it reconnected, the error code was gone, the networker was unfrozen, and heating resumed.

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Love the nature of this forum, and wanted to give something back in case someone is ever looking for a potential fix for error code 59.