Michael_S

This is the install manual, page 41 and 42 seems to me to imply that the feed to the thermostat is 230v and it expects a 230v live return on the call for heat. Anyone else read it the same way or have the same model with a thermostat to confirm? Thanks https://gscs-b2c.lge.com/downloadFile?fileId=EoU8EjdDipG6CZuc7jLw

Thanks both. Think I have the right controller and have managed to fix the switching off issue but finding out how to clear all the 'reservations' Am now running on AI mode using the WT but it is currently so mild I am not sure if it is really working or not, I am just getting some really short cycles - say 5 mins every 20 mins. Does anyone use the AI/weather comp mode? What does it do beyond the high temp setting, say the settings are -10 +50 and +15, +25, what happens if the air temp is 16C+ does it automatically power off or will it continue at 25C whatever the air temp?! Finally still on the question of thermostat control - if I connect a wifi switch to the thermostat and get it to send a mains live output to the control terminal when I want the unit to come on and no output when I want it off, will this work to control the unit (if I set the correct dip switch?

Thanks again - you don't happen to know how the on/off thermostat is connected inside the outdoor unit do you? Do you control it via a wired connection or use a remote wifi switch?

Space heating only. The aux heater is disconnected and turned off via dip switches Thinking I will remove the Netatmo receiver even though it is not supposed to be doing anything. With your control method, what sort of signal are you sending to the heat pump and how is it connected - is it simply an on/off signal or is it a temperature signal? Mains voltage or low voltage signal? Thanks

OK. It is turning off every hour, on the hour, regardless of how long it has been running at that point....

Thanks. Part of me wonders if I have the right controller for the heat pump (12kW HM121M U32) When you say you use thermostat control, I can see how you would feed the heat pump with a temp sensor (our heat pump has a netatmo receiver unit inside but didn't come with the sender unit so I have set the dip switches to ignore it) but is there any way to just give it a simple 'on/off' signal which you could then control with whatever home automation software you had available? You can't simply control the power supply as it seems to lose all settings and start in the 'off' condition - plus probably not that good for it too simply power off in the middle of operation. Thanks

I have this controller but for example enter time set with a short press of the settings button - a 3s press takes me into the configuration settings. Do you have this controller? How can I just make it turn on and run - the on button and choosing Temp mode or AI mode does make it run but it then just goes to off after about an hour, pressing the on button makes it go again. no error messages. Don't think I have set p any reservations although when I go into the weekly reservations menu I see some odd times with the hours and minutes outside of the 0-24 and 0-60 range.

OK.. I have got past CH14 using a second pump, currently running about 12.5l/m System runs and heats the house nicely but then after about an hour seems to turn itself off in that the operate light goes off and the it just sits. Seems to happen whether I use the weather comp 'AI' or a set flow temp. Not sure exactly how the programming works with simple sleep, holiday etc 'Reservations'. Ideally I would want it to run 24/27 in the weather comp 'AI' mode with an offset during the night hours but no idea if this is an option. I am using it with no thermostat and with the auxiliary heater turned off (dip switches set accordingly) and heating only no hot water. I have printed the user and install manuals but they are not entirely clear and some of the programmer functionality seems to be slightly different. I purchaser the programmer separately from the heat pump and do wonder if it is 100% compatible? Any suggestions welcome. Thanks

Again, thanks both. I think the heatpump board is ok as it is definitely sending power to the pump live. I was wondering if the heatpump got clever with the pump speed/power as part of regulating the output and flow/return temp difference but hopefully it might still cope with a standard fixed speed pump. It being a second hand heat pump I don't want to throw huge sums of money at it.

Thanks for the comments so far. OK - there is power going to the pump. So we took the pump apart and it seemed to spin fairly easily by hand. It did not seem to turn when connected to the heat pump, so then we tried connecting directly to a power supply and it did not turn either - except one time when it did, but we can't make it do so again. So now we are not sure if the pump is working or not and they are hardly a cheap swap out part. Can they be replaced by any random pump of the same power or does it need to be one with electronic control via pwm? Thoughts?

Sorry for hijacking a thread. We have a new to us 12kw Thema V (perhaps 6 years old) but on connection we are getting the dreaded CH14. I am wondering if the circulation pump (a wilo) is working at all. Any suggestions for confirming it is actually running, I can't hear anything or feel any vibration, turning the speed/pressure selector makes no difference. It has been siting for awhile so might be seized/rusted. I can not see the the end of the spindle to insert a screwdriver as the control unit is on the end not the side so I am not sure if this model has screwdriver access or whether it needs to be unbolted in half to manually try and loosen the impeller/spindle. Thoughts?