Aprilaire 800 Series Troubleshooting Manual

Troubleshooting Guide for Installers and Call Center
Required Tools:
1. Clip on Ammeter/voltmeter
2. #2 Phillips screw driver
3. Needle nose pliers
4. Slip joint pliers
5. 2.25" c-clamp (or equivalent device to override canister door switch)
6. ½" and 7/16" open end wrenches
7. 2" 18 gage wire stripped at both ends
8. 1/8" by 2 ½" flat head screw driver
9. 5/16" nut driver
10. Model 80 steam humidifier replacement canister
Note: Identify the symptom to be analyzed prior to shutting down the humidifier for troubleshooting.
Turning off or disconnecting power will reset all lights and may impede the troubleshooting effort.
Identify the Problem:
1. Humidifier doesn't turn on. See sections System Setup Verification, and Using Lights to
Troubleshoot # 1
2. No or low humidity with no abnormal lights. See sections System Setup Verification and Verify
Operation.
3. Solid red service light. See sections System setup Verification and Using Lights to
Troubleshoot # 5.
4. Flashing red service light. See sections System setup Verification and Using Lights to
Troubleshoot # 4.
5. Solid yellow steam light. See sections System setup Verification and Using Lights to
Troubleshoot # 2.
6. Solid red fill light. See sections System setup Verification and Using Lights to Troubleshoot #
3.
7. Moisture in or outside of the duct. See Moisture in the Duct section
Control Panel Light Explanation
1. On/Off – Solid Green, indicates humidifier is turned On. See Using Lights to Troubleshoot
section 1.
2. On/Off – Flashing Green, indicates power is restored to humidifier originally in the On state.
Flashes for one minute then remains solid green.
3. Fill – Solid Green, indicates fill valve is open.
4. Fill – Solid Red, humidifier is shut down for fill fault. See Using Lights to Troubleshoot section
3.
Single PCB model 800
1