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MikeFl
MikeFl
@mikefl
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Reputable Member
Joined: Apr 17, 2023
Last seen: Sep 10, 2025
Profile Activity
Topics: 1 / Replies: 118
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RE: Is the Grant controller a thermostat?

@marvinator80 You can see the LWT (and Return WT) on the Controller. Slightly easier than getting to the other parameters, you press the 'return' key ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Is the Grant controller a thermostat?

The optimal figures will be different for each house, but those figures don't look wildly out. 21 01 is the fixed LWT (leaving water temperature); s...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Is the Grant controller a thermostat?

@allyfish Ditto for my Grant 10kW - it gets closer to the target LWT after each iteration following the defrost cycle, but never seems to quite make i...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Is the Grant controller a thermostat?

Grant couldn't make it any simpler(!) ... or not ... Go to the Controller, and open up the flap: Press 3 buttons at the same time: the one that lo...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Grant Aerona 13KW - can I boost it?

So far as I understand it, pressing the up/down has no effect (other than to change the number being shown). In the installation guide: "Please note...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Grant Aerona 3 Help programing

I wouldn't take the cover off the EP001 - just trace where those 4 white electric cables are going to. At least one will be carrying the control signa...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Icy cold weather, weather compensation and consumption

This will be my first winter with my HP, and it currently seems to be struggling ... it's been trying for 3 hours to hit the target LWT for 0°C (46.5)...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Grant Aerona 3 Help programing

Looking at your first picture, showing the HW cylinder, you can see (from the top) the HW Timer and Thermostat (these are controlling the DHW times), ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Grant Aerona 3 Help programing

It's hard to tell. Having the Chofu controller in the airing boiler room is generally where they are placed - and as such, the "internal temperature" ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Do setbacks save energy without compromising comfort?

@derek-m I'm trying to get decent data out of my Grant Aerona over modbus too. Sadly, it also provides low resolution data; key values such as LWT and...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Grant Aerona 3 Help programing

Your display is confusing to see on a Grant controller. The symbols you have highlighted ('On' means a Timer program is currently running; the clock s...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Rule change re ASHP

Attached as a PDF is anybody fancies a read.

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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