Since then I’ve had no air issues until yesterday (1st May) when running the the DHW cycle it got no heat recorded at all the day before (30th April) was fine
I’ve checked system pressure approx 1.5bar which it is has been for months no change.
There have been no changes to the system the only difference is for the last week or so we have not run any heating its only been running DHW cycles.
With that last point in mind this morning i ran the heating a couple of times to see and again i’m showing no flow at all which is odd as with air issues before i would get flow with lower temps until the temp got hot enough for the air to come out of solution.
Hi David,
Heat meter LCD display still on so assume that means it has power.
I disconnected and reconnected cables to EmonHP then power cycled the EmonHP
I can’t look at the display at the moment as I’m at work.
Yes all inputs reading every 30s ish
I’m at work now too but when home will check my Axioma display to see if there is a register on the unit that shows present flow-rate. (I’ve never inspected that display )
If there is, we can determine if the “fault” is at the axioma end or the emon end.
It’s encouraging that you are seeing flow and return temps from the axioma and I’m assuming that your heating is working OK, and that this is just a metering error?
I’m sure bumping up the pressure to 2bar won’t hurt, but low pressure seems unlikely to be the main cause here (the issue exhibits at low flow temps which , in my experience , isn’t when air becomes a problem)
Hi Ian,
I checked on the display of my Axioma and yes, it does have a register that displays total cubic metres of flow. It increments when the HP is working.
Does yours?
Cheers, David.
I’ve just got back from a weekend away and increased the pressure a bit more not quite 2 bar and just manually turned on a hot water cycle and even from stone cold I’m not seeing any flow at all.
I’ve checked the m3 screen while it’s running and it’s not increasing.
Also every screen has a small exclamation triangle in the bottom right hand corner there is also a screen with Er 4001 (quick update ive also seen it show Er 0001) but a quick Google isn’t turning anything up?
4001 apparently means temperature differential is lower than permissible limits (that’s the 4) and no signal, the flow sensor is not filled with water (that’s the 1)
