[Solved] Domestic hot water timer doing crazy things on my Grant Aerona3 10kW air source heat pump

Mellow · 2024-07-10T08:19:35Z

Hello everyone. Description of setup and problem System installed February 2024 - Eco4 grantGrant Aerona3 10kW air source heat pump180 litre hot water cylinder - not pre plumbedHeatmiser 4 zone touchscreen hot water timer TM4-TSManual cylinder thermostat, Code 542902Domestic hot water DHW is timed to come on 1000hrs and go off 1400hrs on Saturday. No other times just on Saturday. On Friday night at midnight the DHW comes on and the display on the timer reads on until 1400hrs. At 1400hrs the display reads off until 2400hrs. With the timer left on auto the DHW will come on again Friday night at midnight. Again the display reads on until 1400hrs and this will happen every week.The timer has been replaced with a new one by the installer's heating manager and set to come on Saturday 1000hrs till 1400hrs only. Exactly the same things is happening as before. The DHW does not come on when it should but persists in coming on at midnight every Friday.I have searched for the problem happening to others via the internet but have not found any. I am hoping someone out there can help and suggest where to go now. It is very frustrating.I have taken photos of the displays and requested further investigation by the installers. I will contact Heatmiser and Grant for help. Of all the internet searches this forum seems very helpful and informative. Any suggestions gratefully received. If I do find a solution I will post it here as it may help someone else with the same problem. Thanks.

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Domestic Hot Water & Cylinders

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Mellow

(@mellow)

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Joined: 2 years ago

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Topic starter 22/07/2024 8:50 pm

Thanks @allyfish for the pics and info. Spoke to the installer today and will be returning to replace what is probably a faulty thermostat. I will send details of yours and hopefully they will fit the same.

👍

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