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Old 01-17-2015, 01:02 PM   #1
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Water not getting to humidifier


Water not getting to humidifier, April Aire 550 with digital control, the control is a panel near the furnace, and part of my regular thermostat.

I replaced the solenoid valve, but its still not working.

When I set the humidistat to test and check the current with a multimeter its not getting any volts.

When I test the 4 pairs of wires going to the humidistat only one (the 2nd pair from the left) has voltage while its on test, and thats about 1.8 volts.

What could be the problem here?

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Old 01-18-2015, 05:54 AM   #2
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Transformer for humidifier may be burned out. Should be getting 24 volts.

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Old 01-18-2015, 05:58 AM   #3
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Quote:
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Transformer for humidifier may be burned out. Should be getting 24 volts.
Do transformers typically burn out with out an additional problem?

Could it be the humidistat board?
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Old 01-18-2015, 06:28 AM   #4
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They do wear out on their own. Was the furnace running when you were checking for voltage. It may be wired up that it only has voltage when the furnace is running for heat.

The board need voltage sent to it to work. So since it doesn't have voltage, its probably not the board.
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Old 01-18-2015, 07:16 AM   #5
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need to see picture....don't know if its wired direct from tranformer to humidistat to solenoid valve....or if it wired from control board to power transformer when blower come on...either way when furnace is running and himidistat is calling for water you shoud have 24 volts at solenoid valve.. if not you have to trace out the circuit...
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Old 01-18-2015, 10:35 AM   #6
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As beenthere said, most humidifiers are wired so that they only get power to them when the furnace is in heating and it's main blower is running.
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Old 01-18-2015, 11:14 AM   #7
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Thanks! That was it, when the blower was running I have 24 volts +/- AC.

I'm now getting like a slow drip of water, is that how its suppose to be?
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Old 01-18-2015, 12:02 PM   #8
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Should be a lot more.
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Old 01-18-2015, 12:54 PM   #9
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Quote:
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Should be a lot more.
Doh!!!
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Old 01-18-2015, 01:32 PM   #10
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You'll need a helper. If you are sure the water is on to the solenoid. Remove the orifice from the solenoid. Turn the humidistat down so the solenoid does not active. Fire up the furnace and have your helper quickly turn up the humidistat so the solenoid opens and then down quickly. If you get a steady flow of water then the orifice is clogged. It's a tiny hole so it clogs easily. Earlier this season I thought my solenoid was bad when all it was was a clogged orifice.
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Old 01-18-2015, 01:33 PM   #11
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make sure your water valve is fully open...and make sure the orifice for the tubing going to water panel on humidifier is not clogged...

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