Kingspan Aeromax 8kw fault code 14

[Wads]

Hi I am new to the forum which I found when researching the above fault on my Kingspan Aeromax 8kw Khp0039 Ashp. I shut down the heat pump in March and have just switched it back on to test the heating system before winter. However it is showing a fault 14 which according to the manual is “loss of signal from inverter board/ high temperature release (thermostat on compressor 120 degrees +/- 4 degrees C).

There was a previous post on the forum concerning fault 14 which was due to loss of coolant in the compressor. However my symptoms are different as the compressor mentioned in the previous post started for a period before triggering the fault. Mine does not start, nor does the water pump or the fan, I just get the flashing led on the gmc board. Luckily I have a controller and have been able to test the water pump which seems to be working ok. I have also done an ohms test on the compressor windings and checked for any earth fault and the compressor seems fine. I have checked the temperature overload sensor on the compressor which reads about 0.1 ohms which seems to be within the expected tolerance. As per the maintenance manual I have checked the connections on the inverter board and these seem fine. There are no obvious issues that I can see on the inverter board, all the capacitors & fuses etc seem fine and nothing looks burnt out. I have tried, via the controller, to do a factory reset but am still getting a fault 14. I am not sure how the inverter board is linked to the gmc board as non of the wires seem to go between the two boards, does anyone know if these are linked and if so where is the link on the gmc board?

At a loss to know what to do next, I spoke to Kingspan support, but they don’t have any support for their ASHP’s anymore and referred me to Carrier UK because they produced the units which are effectively a rebadged version of one of their ASHP. Carrier were quite helpful, I managed to obtain their maintenance manual. However, they pointed out that the Kingspan units were manufactured in their French factory, did not necessarily have the same internal components as their own machines and even if they did the software stored on the inverter and gmc boards are probably different. This seems to be backed up by the wiring diagrams in their manual because most of the wires have a different colour code. They advised, because of this, if the problem is the inverter or the gmc boards they would not be prepared to supply replacements. They have suggested I get a local air conditioning engineer down to have a look. However, before I do that, I wondered if anyone on the forum had any other ideas of what else I could try. Also if the inverter or gmc boards are faulty does anyone know if there is anyone in the uk that is able to test and fix the boards?