I’ve got a Samsung gen6 ASHP, which I am trying to use for cooling. I have a large Harnitek fan assisted radiator in my main living room. Whenever I put the cooling on after about an 40 mins I get the e911 flow error.
I’ve checked the flow sensor its working fine, and on a cooler day a few weeks ago I put the heating on for a couple of hours and it works fine. So is this a pump problem, is it struggling due to the cold water and increase viscosity, thus can’t pump it round effectively. Maybe a pump with bigger head would help?
You’ll need to remind us of your setup @EcoBaker.
Do you have a buffer tank**?
Do your radiators have TRVs? (If so, could they all be closing for some reason?)
I’m pretty certain that the water viscosity isn’t the problem - your water temperature difference between heating and cooling is probably only 20-25degC (viscosity might be 20% more, and density maybe 5% more, but that shouldn’t kill the hydraulics).
**Edit: If so does your arrangement look like this?
I don’t have a buffer tank, I’ve got standard radiators only and one Fan assisted radiator. All of them either don’t have TRV’s or the TRV is full open. I have about 55L volume in the radiators, the pump I have is upm3 Flex AS 25-70 130 AZA wired for pwm control.
Worth a try. I just checked your pump spec - 52W max so you’re nowhere near the max 0.5A current. So you can probably ignore my previous post…
BTW what is your water flow? Is it running close to the minimum allowed? (~7lpm from memory)
Thinking on… yes your PWM could have been running the pump speed down to the point that the low flow trip cut in. So a good idea to try running at constant full speed, as a test…
It did run for several hours, but im now back to the same problem with 40 mins run time max before getting e911 error. I think it something to do with flow temp being to low and it closing the valve for some sort of condensation protection, which shouldn’t be happening if my flow temp is no lower than 16
Can you clarify this? What parameters changed (if any) between the “run for several hours” and the “40min run time max”?
Which valve are you referring to here? And do you have UFH?
Is it worth trying to increase the min LWT from 16degC to (say) 18degC to rule out controller temperature rounding errors?
If the problem persists it might be worth firing off an email to the Samsung UK Helpline. They can be very helpful with clarifying some of the more obscure controller algorithms.
I didn’t make any changes between the run for several hours and run for 40 mins. I only have radiators.
So I’ve worked out today that as long as my flow temp doesn’t go below 16 degrees It keeps working. It started playing up yesterday after dark, so maybe as outside temp dropped, the flow temp also dipped and caused it to stop.
Whats the best way to contact Samsung is there an email address?
UK Helpdesk are at [email protected].
My contact there is Nick Kirwan and he’s been very helpful and patient. (They all share this email address, but if you start “Dear Nick…” he’ll probably be the one who replies.)
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