26
Step
Possible Cause
Check-out procedure
Corrective action
Electronic air filter and Humidifier
8
Condensing unit
Check for 24 volts between
terminal Y and C on the
electronic fan control
Yes - Compressor ON
No - Check thermostat and wiring
9
Electronic air filter
Check for 120 Volts on
terminal ''EAC'' of the
electronic fan control
(thermostat must call a Heat,
Cool or Fan ON demand
Yes - Electronic filter failure
No - Change the electronic fan control
10
Humidifier
Check for 120 Volts on
terminal ''HUM'' of the
electronic fan control (burner
must be energized)
Yes - Humidifier failure
No - Change the electronic fan control
7.0 SERVICE
WARNING
ELECTRICAL SHOCK, FIRE OR EXPLOSION HAZARD
Failure to follow safety warnings exactly could result in dangerous
operation, serious injury, death or property damage.
Improper servicing could result in dangerous operation, serious
injury, death or property damage.
• Before servicing, disconnect all electrical power to furnace.
• When servicing controls, label all wires prior to disconnecting.
Reconnect wires correctly.
• Verify proper operation after servicing.
REGULAR MAINTENANCE
Check complete operation at least once a year. In Canada see B139, (Maintenance), for
recommended servicing procedure. Clean flue pipes on a regular basis. Replace flue pipes if
there is any sign of corrosion or other problems. Gaskets should be checked and may have to
be replaced.
