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Grant/Chofu fault codes

 
Air Source Heat Pumps (ASHPs)
Last Post by bretix 1 month ago
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 bretix
(@bretix)
Estimable Member Member
604 kWhs
Joined: 2 years ago
Posts: 79
Topic starter 09/02/2025 3:52 pm  

Without heating over the weekend ☹️ 

WiFi Nest tells me it's heating but the radiators are stone cold.

Checked the controller in the garage and got P1.

Done the recommendations reset on the controller and the HP but cannot fix. Only thing I haven't got is a multimeter and the only 'experiment' I did recently was to try the heating on schedule with a one degree variance, but don't think this could have affected?

Will be 🤙 Grant in the morning for technical support but looks like I'm gonna need a new PCB or a pump 

Anyone else had this experience?

 

2 10kw Grant Aerona3
Heat loss calc 16.5 kw @ -2.8 degrees
4.32 PV


   
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MikeFl
 MikeFl
(@mikefl)
Reputable Member Member
1277 kWhs
Joined: 2 years ago
Posts: 122
10/02/2025 10:27 am  

Sorry, no. My Grant has only died once and that was me causing the RCBO to trip. If the fault reset didn't work (and assume you also tried the all-powerful "turn it off then back on again") then it might be the main PCB, as suggested.

Amending the heating demand shouldn't have any damaging impact on the HP.

Hope Grant can sort you out. Good luck. 

Grant Aerona 3 10kW


   
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 bretix
(@bretix)
Estimable Member Member
604 kWhs
Joined: 2 years ago
Posts: 79
Topic starter 10/02/2025 10:02 pm  

@mikefl  rang technical this morning and they suggested 1st  to raise the pressure and then bleed the radiators if no joy from that then engineer to inspect and either clear out any debris or replace the pump/pcb 🫤 another 24/48 hours without heating and hot water .

2 10kw Grant Aerona3
Heat loss calc 16.5 kw @ -2.8 degrees
4.32 PV


   
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