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Daikin Short Cycle Query

Ubert767 · 2025-11-07T22:34:22Z

This is a plot from a Shelly EM monitoring the supply to my 6 kw Daikin. Are the spikes between the DHW reheat episodes indicating "short cycling"? Thanks

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Air Source Heat Pumps (ASHPs)

Last Post by RadWhisperer 8 months ago

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TreeWizard

(@treewizard)

Active Member Member

Joined: 8 months ago

Posts: 9

09/11/2025 7:49 pm

I've also got an 8kw Daikin, in the last week I've noticed it oscillating between 350-600W at quite a high frequency for longer periods.

Is there some explanation for why it might be ramping up and down every minute?

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ASHP-BOBBA

(@ashp-bobba)

Prominent Member Member Professional+

Joined: 2 years ago

Posts: 490

09/11/2025 10:24 pm

@treewizard is this not the electrical pulse that keeps the compressor warm? most of these top end builds use around 1kW per day in the winter to either power a heater tape wrapped around the compressor or send a current to the windings that does not move the motor but keeps it warm and I would imagine Daikin does one of these? (I not an expert on Daikin ASHP)

This post was modified 8 months ago by ASHP-BOBBA

AAC Group Ltd covering the Kent Area for design, supply and installation of ASHP systems, service and maintenance, diagnostics and repairs.

👍

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TreeWizard

(@treewizard)

Active Member Member

Joined: 8 months ago

Posts: 9

11/11/2025 10:40 am

@ashp-bobba That would explain it thank you, I'll take a look at the manual. If not, I'll ask Daikin at the next service.

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RadWhisperer

(@radwhisperer)

Eminent Member Member

Joined: 9 months ago

Posts: 35

12/11/2025 8:53 am

Just a suggestion but upload your images to an AI agent such as Grok with a full description of your installation and you will get a good description of the symptoms and some suggestions of things to check. I've used this method to dial in my 4KW Daikin when switching to "pure" weather comp.

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