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December 2004
Checking the Sensor
Furnace Voltage
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5-6
If the sensor furnace impedance test indicated that the sensor furnace
is good, continue the troubleshooting procedure here.
Note: For information regarding component locations and/or wiring
connections in an optional enclosure, see Appendix C.
1. Using a digital multimeter, measure the sensor furnace AC input
voltage on terminal block
TB2
location of
and the
in Table 5-4 below should occur.
Table 5-4: Furnace Voltage Reading
Voltage Reading
approximately
full line voltage
no voltage present
2. Remove the terminal board fuse (see Figure 2-2 on page 2-10) and
check it for continuity. If the fuse is blown, replace it with a new
fuse of the same size and type listed in Chapter 6, Specifications.
3. If the fuse was good, the main voltage supply is bad. Check the
external disconnect device and/or the main voltage source to that
device.
Based on the recommended action in Table 5-4 above, proceed to the
appropriate section for instructions. If the problem has still not been
resolved at this point, contact the factory for assistance.
TB2
. See Figure 2-2 on page 2-10 for the
HEATER
pins. One of the conditions listed
Recommended Action
Defective digital display unit - replace
the digital display (see page 5-22).
There is no power reaching the sensor
furnace - proceed with the next step.
Service and Maintenance
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