NO ERROR CODES SHOWING.

Hey @JulesSteele,

I’ll tag a few members from other threads to raise some awareness to see if someone can help you. 

@Ecodanwarrior, @juliamc, @nealmurphy @M.isterW, @Raze1000 & @Peter E - Would any of you have any advice for the issues above? 

@JulesSteele No particular experience in ASHP but there is a video showing how to get the error codes but I’m assuming you have done this which is why you are saying there are no error codes.

The only other bit of advice is that these devices are computers (well, microcontrollers which have common issues with computers) so if you can turn it off for a while (five minutes) and turn it back on it may just sort the issue out and avoid a call out.

I don’t know if the installation/instruction manual has anything specific to say on this.

I’ve just had a quick trawl of the internet and came up with the site below and it comes up with a chatbot (perhaps leading to a human being later on) and a discussion may help to narrow the cause of your problem without a call out being necessary.

https://www.justanswer.co.uk/hvac/hk7ji-i-ve-l9-code-error-mitsubishi-ecodan-heat-pump.html

I hope that helps

Peter

Thanks Peter, turning it off for a while seemed to kick start it working again! Just hope now it doesn't happen again!

@JulesSteele  I have a three year old Daikin. For the first time, last month, I had an error code on the heating for water pressure that shut off the heating (hot water fine). I seemed to have rectified it by bleeding all the radiators and doing a control-alt-delete on the main outside heat pump isolator switch. Hopefully yours is something similar.

Thanks @nealmurphy and @Peter E for offering support! 

@JulesSteele Keep an eye on it for the next week and make sure nothing else pops up as an issue. Let us know how things go 

It’s easy to forget that a lot of household objects are run by microcontrollers which have a habit of going dumb after a while. The ones that are regularly switched off usually pose no problem but those that run all the time eventually stall at some point. E.g. video recorders, routers, heating systems, computers in modern cars particularly EVs. All of those examples have needed a reset at some point in my household and have all come back to life after a reboot. C’est la vie!

So turning it off worked temporarily. Then when the hot water came on this pm the heating is now off again. 

Where did you turn it off?

@JulesSteele I’m sorry that’s happened again. It sounds like there is an intermittent fault.

1. Can you see if there are any error codes using the video at the beginning of the thread? That is always useful information to have.
2. Quite often there is a flow chart in the boiler manual to help diagnose faults. You should be able to download one if you don’t have a paper copy. Have a go with that.
3. Have a go with the link below and see if having a chat can get you any closer to a diagnosis.

https://www.justanswer.co.uk/hvac/hk7ji-i-ve-l9-code-error-mitsubishi-ecodan-heat-pump.html

Come back on here and see if we can use any additional information you may have. Good luck!

Peter

Hello.  I have the same problem.  Do you know what the problem is now?

Hi Daniel, 

Yes, it seems the previous owner had two settings going on, one for April-Sept and one for Oct-March. When October came the new setting kicked in which was to have the heating turned off from 4pm. Because it was the main setting anything I did manually couldn't over ride it. I switched to factory settings and reprogrammed everything and problem solved! 

Thank you! I will try to reset everything in the heat pump.

@JulesSteele Thank you for coming back on and helping @Daniel Panayotov

I started out as a forum volunteer in exactly that way. Getting help on here and then coming back to help someone else with the knowledge you gained. I think you are now the Ecodan expert Well done!

Peter

PS Moderators: Can you change the Best Answer to @JulesSteele