baseboards are hot, but room is cold


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Old 01-08-15, 10:32 PM
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baseboards are hot, but room is cold

We have hot water baseboard heating system in our condo. The heat was fine until 4 days back. The temp started dropping to 70F. Yesterday, it went up to 80F after moving the thermostat down to 60 and then back to 80. We had heat all day yesterday. It started dropping again this morning and is at 70 since 5PM.

We took off the zone valve cover, the red part seen in the pic, so it's not connected to the thermostat at the moment. The zone valve needle is moving up and down. When pressed down, we hear hissing water. No noise when it's up. Both the entry and exit ends of the pipe are hot. Actually, the pipes are very hot to touch, but room temp is uncomfortable lukewarm.

The heating contractor was in the building and said everything is running fine in the boiler room.

What could cause the temp to drop??
 
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Old 01-08-15, 11:31 PM
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The baseboard needs cleaning. All of the carpet fibers & dust is acting as insulation. The whole baseboard needs to be raised at least a couple of inches off the floor. Air has to be able to flow across those fins from bottom to top.
 
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Old 01-09-15, 08:10 AM
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Agree about cleaning, dust can act as insulator, but will that cause a sudden drop in the temp?
 
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Old 01-09-15, 08:38 AM
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Your not getting proper air flow, even the carpet up against the bottom of the fins is blocking it. You probably had just enough to heat up until the past cold snap, now you don't have enough heat to compensate for the heat loss in your unit. The result is that your interior temp is dropping.

Clean the baseboards, cut back that carpeting so air can freely move upwards through the fins. That should make a world of difference in your heating capacity.
 
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Old 01-09-15, 09:52 AM
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will that cause a sudden drop in the temp?
As sudden as the outdoor temps plunge.

I know you're in IL, but didn't you have outdoor temps plunge when the cold wave came down?
 
 

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