@ntruby  ok, first to explain the 61deg......eddie will either heat up the immerser until his temperature sensor tells him to stop.....or until the immerser thermal cutout switch cuts it out so either the immerser or eddie has a cut off temp of circa 61deg. This is independent of the heatpump.

To check if you are actually able to heat the water in the cylinder using the heatpump you can do the following:

Check the DHW temp on the screen if it is lets say under 40 then the DHW should be heating. Check by following my previous suggestion:

Posted by: @derekdeleon

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You can also check the status from the front screen by doing the following:

Press the gear button and navigate to operation status.

You would expect to see compressor highlighted in blue to show it's operating and also the water pump in blue. The booster heater should be greyed out as it shouldn't be on.

If the temperature isn't low enough to trigger it to be heating the water you could manually raise the set temperature to encourage it into action, but remember to set it back down later 🙂

Just found a snippet in the Freedom heatpumps documentation which seems to say the hysteresis is set to 7deg so that ties up with your original figure of 50deg set temp falling to 43deg. If you can confirm that your heatpump is actually doing the DHW I think your system might be fine.

Just to check, I take it that you are putting much less cold water in when you are filling the bath? It's kind of a habit to put on both taps at the same time when you have a gas boiler as the water is that much hotter, but with the heatpump water being lower temp you need much less cold water. Sorry if i'm stating the obvious.

@derekdeleon OK right now the water temp is 53.5 and I can't set the desired temp above 60C, so I have reduced it to 45C and will test it out in the morning.

The bath has a mixer tap so I don't think that adding too much cold is the issue.

Thanks!

Posted by: @derekdeleon

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Just found a snippet in the Freedom heatpumps documentation which seems to say the hysteresis is set to 7deg so that ties up with your original figure of 50deg set temp falling to 43deg. If you can confirm that your heatpump is actually doing the DHW I think your system might be fine.

Thank you Derek and Gary: this has been so interesting and informative!  If only my supplier could have left some simple instructions.

The heat pump is definitely heating the water.   Field setting 3023 is 5C, so I am still not sure how the temp got down to 44C.

If the temp is too low what can I do to force the heat pump to kick in please?

As far as I am aware the  only way to persuade the heatpump to come on if it's within the 5deg hysteresis would be to manually set a higher temperature.

Thinking back to your period of no DHW when eddie went kaput, it is entirely possible that the DHW was simply switched off on the controller if eddi had tripped the breaker or the power was switched off on the heatpump. To enable or disable the DHW you go to the main screen where you see DHW and heating on the same split page, right button to highlight DHW then hit power button and the DHW will go blue if it's on and grey if it's off.

With that in mind, to prevent an accidental switch off of the DHW due to power outages etc you can set a couple of scheduled ON periods with no off periods say 0300 hrs and 1500hrs using the instructions I posted earlier

Posted by: @derekdeleon

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From the front screen press the gear button and navigate to schedule and press ok.

To add a schedule highlight add schedule, press ok, daily schedule, press ok, set type to DHW (not quiet), set on or off and set time.

This advise is actually from Freedom heatpumps document, so if they're mentioning it I'd bet lots of people have been caught out by inadvertent switching off of the DHW.

You can actually gain an extra bit of efficiency by setting up a proper DHW schedule if it suits your lifestyle and needs. It is more efficient for your heatpump to heat a cooler tank than it is continually topping up the hottest 5deg. My own personal schedule is :

0530 to 0700 and 1300 to 1400 and 1910 to 2030

Tank is 250 litres, family of four.

This may not suit you and runs the risk of the tank not being hot when you want it, but with a little thoughtfulness it can be fine 99% of the time. Two out of my three timed periods coincide with the cheap rate on the Cosy Octopus heatpump tariff, which I use. Obviously if you do a proper schedule you don't need the afforementioned two ON settings to mitigate accidental switch off.

Posted by: @derekdeleon

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As far as I am aware the  only way to persuade the heatpump to come on if it's within the 5deg hysteresis would be to manually set a higher temperature.

Thinking back to your period of no DHW when eddie went kaput, it is entirely possible that the DHW was simply switched off on the controller if eddi had tripped the breaker or the power was switched off on the heatpump. To enable or disable the DHW you go to the main screen where you see DHW and heating on the same split page, right button to highlight DHW then hit power button and the DHW will go blue if it's on and grey if it's off.

Thanks again, Derek, this has been so useful!   Truth be told I can't recall now what the exact position we were in when the eddi blew up.   Certainly sounds from your description that we shouldn't have been without hot water.

Do Freedom Heatpumps (or anyone else) provide a simple guide for the controller?  I had a look at their site but it's all (understandably) password-protected.

Found a copy on this really good website 🤣 

RENEWABLEHEATINGHUB.CO.UK "https://renewableheatinghub.co.uk/wp-content/uploads/wpforo/attachments/1535/4707-Samsung-Installation-Manual-2022-Digital.pdf"

This should be a little bit more digestible than the Samsung manual.