Hum from baseboard even when it's off

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  #1  
Old 08-31-14, 07:58 AM
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Hum from baseboard even when it's off

There is a humming sound coming from 1 of the baseboards even when it is not heating. I turned the breaker off and the sound stops. The thermostat controlling this is a 12v.
Do you think the baseboard just needs replacing or is it something to do with the remote system.
I'm not even sure why it runs on a remote system as it's only 1 baseboard controlled by the thermostat.
 
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Old 08-31-14, 08:45 AM
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If there is a 12v thermostat, the humming you hear is a transformer. The sound is normal.
 
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Old 08-31-14, 10:35 AM
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There are other rooms with the same setup with no hum behind the baseboard. Seems strange.
 
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Old 08-31-14, 11:06 AM
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Not all transformers hum. Most are quiet like they were designed to be but sometimes with age and heat.... the metal laminations inside the transformer come loose and vibrate.
 
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Old 08-31-14, 11:11 AM
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Is it part of the baseboard or a separate unit behind it?
 
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Old 08-31-14, 11:13 AM
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If you hear it in the baseboard then it's probably inside. There is usually a removable cover over each end of the unit to access controls and wiring. Turn power off before removing the covers.
 
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Old 09-01-14, 10:35 AM
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Seems like a strange setup. The breaker (2 pole ie double lever) runs 3 baseboards.
1 x 1000W with 22v A-c (not sure why it's 22 and not 24)
1 x 750W also with 22v ac
1 x 500W 240 ac so thermostat controls without a relay?

I don't fully understand the 2 22v a-c connections. Surely they must go via a relay /remote box but why have 2 separate remotes if they are each controlling 1 heater only?
 
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