Mitsi heat pump is 'pulsing'

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duckDecoy

795 posts

Ultimate Geek

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#304283 20-Apr-2023 14:58

Last night our mitsi heat pump starting making louder than normal noises. Going up close it was almost like its 'pulsing' or 'surging', it sounds like it is blowing harder for say 2 secs then softer for 2 secs, then harder for 2 secs and so on.

We've never heard this before. Did the old turn off and on again, no change.

Anyone know what this could be? I've turned it off for now in case it is serious, and will get someone in that's the thing to do. But perhaps there's a known solution out there.

Thanks

timmmay

19638 posts

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#3066084 20-Apr-2023 15:34

Can you call the installer? If you didn't have it installed sometimes it's written on the outdoor unit. You could also try calling the manufacturer.

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lxsw20

3198 posts

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#3066086 20-Apr-2023 15:36

Are the filters clean?

RunningMan

7972 posts

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#3066115 20-Apr-2023 16:22

Inside or outisde unit?

tweake

1057 posts

Uber Geek

#3066156 20-Apr-2023 17:41

also what was it set at? eg aircon or heating, auto fan or fixed fan, quiet mode etc.

duckDecoy

795 posts

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#3066391 21-Apr-2023 10:05

The filters were cleaned about 4 months ago, we get them done annually by the installer. But I will check.

Its the internal unit, and was on cooling.

It is definitely more noisy than we have heard it before.

fe31nz

1086 posts

Uber Geek

#3066813 22-Apr-2023 00:51

duckDecoy:

The filters were cleaned about 4 months ago, we get them done annually by the installer.

There is no need to get outside help and pay them a whole pile of $$$ to do a simple filter clean - unless you are so old you can not get up on a chair to open the heat pump and get the filters out. Filter cleaning is designed to be done by the user and is very easy. Your heat pump manual tells you how to do it. If you have lost the manual, it can be downloaded from the Internet, usually directly from the manufacturer's site. Dodgy heat pump installers often tell you that they need an "annual service", but there is no truth in that and your heat pump manual would tell you if that was needed. And what the "service" would entail. "Annual services" are just a scam.

tweake

1057 posts

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#3066853 22-Apr-2023 10:51

duckDecoy:

The filters were cleaned about 4 months ago, we get them done annually by the installer. But I will check.

Its the internal unit, and was on cooling.

It is definitely more noisy than we have heard it before.

noise is highly subjective and difficult to diagnose over the net.

could simply be gas in the pipes noise, or the fan speed. some brands/models will bounce the fan speed up and down depending on conditions and settings. eg one of mine does it when on quiet mode. it runs the fan at slow speed then increases fan speed when it starts cooling. you can hear it short cycle at times.

sometimes you can get fan speed change due to change in air temp due to drafts or heat soak. fan stops/slows, temp goes up so fan starts which sucks in cool air and drops the temps so fan stops/slows.