23
22
TROUBLESHOOTING
Applies to both Automatic and Manual Operation unless
indicated otherwise.
TABLE 1
Outdoor Temperature (°F)
Resistance (k
Ω
) ±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 R
Red “Call Dealer For Service” Light
Yellow “Change Water Panel” Light
Green “Humidifier On” Light
90-1227
SYMPTOM
Call Dealer For Service Light Flashing (see
Figure R
)
TROUBLESHOOTING PROCEDURE
Display Error Code: E1:
RH Sensor
Rotate Humidifier Control knob to the “Test/Reset” position. After
5 seconds, the green “Humidifier On” light will blink, resetting
the error. If E1 returns, replace the Humidifier Control.
Display Error Code: E2:
Control Knob
Rotate Humidifier Control knob to the “Test/Reset” position. After
5 seconds, the green “Humidifier On” light will blink, resetting
the error. If E2 returns, replace the Humidifier Control.
Display Error Code: E3:
Outdoor Temperature Sensor
1. Make sure that the Outdoor Temperature Sensor is properly
connected to the ODT terminals on the Humidifier Control.
2. Measure the resistance of the Outdoor Temperature Sensor
by removing the leads from the Humidifier Control terminals
and measuring the resistance across the wires with an
ohmmeter. Confirm the reading with the temperature in
Table 1
. (For Manual Operation, verify that the resistance
across the leads of the Manual Mode Resistor Case is
between 44K and 48K ohms). Reconnect the ODT leads. If
the resistance value does not match the temperature value,
replace the Outdoor Temperature Sensor.
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.
TROUBLESHOOTING PROCEDURE
(CONTINUED)
Display Error Code: E4:
Communication
This only applies to systems wired to an Aprilaire Model 8570
Thermostat (see
Figure Q
).
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. Make sure the
Model 8570 is wired and operating properly according to the
Model 8570 manual.
