Install Instructions

2322
TROUBLESHOOTING PROCEDURE (CONTINUED)
3. Rotate Humidifier Control knob to the “Test/Reset” position.
After 5 seconds, the green “Humidifier On” light will blink,
resetting the error. If E3 returns, replace the Humidifier
Control.
Manual Mode (switch in “MAN” position)
1. Make sure the ODT terminals are clear of any wires that
may short the terminals together other than the ODT sensor.
2. Rotate Humidifier Control knob to the “Test/Reset” position.
After 5 seconds, the green “Humidifier On” light will blink,
resetting the error. If E3 returns, replace the Humidifier
Control.
Display Error Code: E4: Communication
This error applies to systems wired to an Aprilaire Model 8570
Thermostat (see Figure Q) using the “A” and “B” terminals.
Rotate the Humidifier Control knob to the “Test/Reset”
position. After 5 seconds, the green “Humidifier On” light will
blink, resetting the error. If E4 returns, check the wiring
between the Digital Humidifier Control and Model 8570 check
the connections at “A”and “B” on the humidifier control and
the Model 8570. Make sure the Model 8570 is wired and
operating properly according to the Model 8570 manual.
TABLE 1
Outdoor Temperature (°F) Resistance ( kΩ) ±10
-30 231.8
-20 163.4
-10 117.3
0 84.8
10 62.2
20 46.1
30 34.4
40 26.1
50 19.9
60 15.3
70 11.9
80 9.3
90 7.3
100 5.8
Figure M
Red “Call Dealer For Service” Light
Yellow “Change Water Panel” Light
Green “Humidifier On” Light
90-1227