Boy1925

I have an LG Therma heat pump which was installed three years ago without the optional wifi module. i would like to fit that module and wonder if anybody here knows if if there is only one such module or if I need to match my wired control unit to a specific wifi module? I have seen a WiFi module referred to as for aircon units but I’m not sure if that is the correct one. The reference number is PWFMDD200. If anyone knows a reasonably priced source that would also assist.

Yes indeed although whilst I anticipate that my engineer in fitting the new sensor will have been astute to the possibility that the same problem could reoccur, there are many other wires and checking them all will not be easy. The one which caused the problem on this occasion was partially hidden behind the pcb.

The replacement pressure sensor arrived on 16th December and my local engineer attended and fitted it the following morning for which he had to evacuate the refrigerant and solder in the new sensor then refill. Although I was by then away for Christmas, using the heatmiser app I was able to see that the heatpump was working and was able to control the heating of the whole house so arrived back to a comfortable house before New Year. The whole problem arose due to an inadequately insulated wire shorting on the metal chassis. I hope this will not happen again! Happy New Year to one and all.

That sounds like a good solution to the difficulty of controlling the dhw. i wonder if the following would also work:-could a Heatmiser room stat be wired in rather than a plain resistor and thus allow the dhw temperature to be controlled remotely? I am no electrician so not able to assess any problems with this approach nor how to wire it but if it sounds ok to those more electrically competent, I’d like to try it. Clearly some recalibration would be required and that might be a complexity too far!

Thanks ReedRichards, I hope to find a remote way of controlling the dhw. I am told that the replacement part I need should arrive soon so it appears that the part is available.

Congratulations. Xmas came early for you. I am still waiting for a replacement pressure sensor from LG fitting of which I anticipate will require venting off the refrigerant and refilling etc. Did your installer figure where the leak arose in your pump? Incidentally, can you set the dhw temperature by use of the wifi dongle you recently mentioned? That is something I would very much like to be able to do.

Just to give an update, the new pcb arrived early last week but when the engineer fitted it, another fault code appeared and the unit would not run. CH35 appeared, which I believe relates to a pressure sensor fault. I am accordingly now seeking a new sensor and hoping that will resolve the problem. Apparent on removing the old pcb was evidence of a short circuit against part of the chassis due to lack of insulation. There is a suggestion that these short circuits are a known problem for LG in these machines.

I would be grateful to hear if any forum users have had difficulty getting warranty repairs or parts for their LG monoblock heatpump. I have a 5kw monoblock which ran without fault for eighteen months after commissioning until on 31st October it failed and an rcd in our CU tripped. When I reset the rcd the control panel for the heatpump showed fault CH5. Further investigation showed that a component on a pcb in the heatpump had failed-shown by a burnt mark on the pcb. Since then, I have been waiting for a new pcb to be sent to my local engineer for fitting. I am, as you will guess, rather fed up with the slowness of LG to supply this replacement part under warranty and wonder if I am alone in suffering such a delay?