Aprilaire 600 solenoid does not work when the output wires from ''H'' are used. This brought me to replace the original solenoid that I now realize was not defective.
When solenoid wires are jumped to ''R C'' it works just fine.
Is my controller bad? Dad always said, ''The more options you have, the more things that can break.'' I'm referring to the ODT sensor and the whole concept of ''automatic''. I have a humidistat that has been wall mounted for years that worked just fine. I may look to re-route the wires to that controller and save buying new parts.
I have a 2-stage Goodman furnace and have the fan set to ON.
SOURCE: Humidifier control .
if humidifier was wired into thermostat circuit for power instead of seperate transformer , this can happen. you need to see if you voltage going to the solenoid valve. if you do , and it isn't opening, the valve is bad . this is assuming that it is using a # 50 relay to come on only when the fan runs . . make sure the water valve is open
SOURCE: Aprilaire 600 - change water panel light stays on
Turn the control knob to the test/reset position untill the change water panel light blinks to reset the change panel timer. Make shure the furnace is running calling for heat.Turn control knob to prior setting after resetting timer. Hope this helps.
SOURCE: Aprilaire 600 with outdoor senser, knocks when on
if the wire to the outdoor sensor runs close to high voltage wiring it may cause that
SOURCE: Water only runs with humidistat in test/reset mode
you need to make sure your humidity level in the house isnt higher then what your humidifier will provide at any givin outdoor temp. this chart is in the owners manual. you cant remove the wires going to the ODS or it will give an error unless you have a resistor to put in its place. Anyway if the humidifier works in test mode according to AA it works so you may have higher humidity than you think, the highest your gonna get is 45% as the temp outside drops it will allow less humidity so it doesnt cause window condinsation (property damage) here is a copy of the chart. the #s on the left are the dial setting
TABLE 2 – % Relative Humidity Guide
Outdoor Temperature (°F)
-10°F 0°F 10°F 20°F 30°F 40°F
1 10% 10% 10% 15% 20% 25%
2 10% 10% 15% 20% 25% 30%
3 10% 15% 20% 25% 30% 35%
4 15% 20% 25% 30% 35% 40%
5 20% 25% 30% 35% 40% 45%
6 25% 30% 35% 40% 45% 45%
7 30% 35% 40% 45% 45% 45%
SOURCE: My Aprilaire 550 is bone dry. How do I know if its
Turn off the water to the humidifier
Disconnect the water line to the inlet water valve (the solenoid), catch any excess water or drips in a small container
Turn the water back on slowly and see if water flows through the open line (the one you just disconnected - catch the water in a small bucket)
If you have water to the valve, it's probably the solenoid valve - you can test this by reconnecting the water line and turning the humidistat all the way up. You should hear a click as the solenoid tries to open. If it clicks and no water comes out it's the valve. If there is no water to the valve, you'll need to detrmine the reason(s). Sometimes the small line tap valves commonly used with humidifiers can plug up or malfunction. If you try to repair or replace the tap valve, make sure the water is turned off.
If no click, it could be the humidistat or there is no power to the unit.
If the humidistat is bad, you won't hear any click and no power will be sent to the solenoid valve. In that case, the humidistat may be defective.
Depending on your comfort level and knowledge, you can try applying power directly to the valve by bypassing the humidistat, but only try this if you are comfortable working with electricity. The voltage should be around 24 volts (in the USA) , which is low, but requires some knowledge.
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