Aprilaire 62 Safety And Installation Instructions Manual page 12

TROUBLESHOOTING PROCEDURE
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.
(CONTINUED)
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TABLE 1
Outdoor Temperature (°F) Resistance (k ) ±10
-30
-20
-10
0
10
20
30
40
50
60
70
80
90
100
Figure M
Red "Call Dealer For Service" Light
Yellow "Change Water Panel" Light
Green "Humidifier On" Light
90-1227
231.8
163.4
117.3
84.8
62.2
46.1
34.4
26.1
19.9
15.3
11.9
9.3
7.3
5.8
23