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Humidifier runs but delivers no moisture — solenoid valve coil or plunger has failed, blocking water flow into the unit entirely.
Home stays dry even when the humidifier is active; a partially stuck-closed solenoid restricts water flow below what is needed for proper humidification.
Water drips or floods from the humidifier when it should be shut off — a valve stuck in the open position due to a failed plunger or debris in the orifice.
Furnace and humidistat are both calling for humidity but the humidifier does not respond — solenoid valve not opening when 24V signal is applied.
💡 Pro Tip: Is Your Humidifier Solenoid Valve Faulty?
Your part is likely the culprit if you notice any of the following:
⚠️ Whole-house humidity stays low even when humidifier is running
⚠️ No water flowing into the humidifier water panel or drum
⚠️ Humidifier runs but produces no visible humidity output
⚠️ Water continuously dripping or flooding when humidifier is off (valve stuck open)
🔍 Diagnostic tip: With the furnace and humidifier ON, use a multimeter set to AC voltage — place probes across the solenoid valve terminals. You should read 24V AC when the humidistat calls for humidity. If you have 24V but no water flow, the valve coil or plunger has failed — replace the A2012-S150 solenoid valve immediately.
📦 What's in the Box
✅ 1× A2012-S150 Humidifier Solenoid Valve (24V AC, 125 PSI, 2.3W, 3/64" Orifice, Brass Body)
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Disclaimer: Compatibility information, part numbers, and model fitment data on this page are sourced from manufacturer databases and third-party references. While we strive for accuracy, please verify your appliance model number before ordering. Heima is not responsible for errors or omissions in compatibility listings.
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