7
−
64
62-11389
Alarm
NO.
Steps
Alarm/Cause
Corrective Action
109
CHECK 1EVCON RELAY COIL
•
TRIGGER–ON: Evaporator fan motor contactor (1EVCON) circuit is shorted. (The contactor output
from the microprocessor (4MP15) is negative, so the circuit will not be shorted to ground, but is
shorted either within the contactor coil itself, or to a positive wire.)
•
UNIT CONTROL: Alarm only
•
RESET CONDITION: Auto Reset or alarm may be manually reset via keypad or by turning the unit
off, then back on again.
NOTE: Follow the steps below until a problem is found. Once a repair or correction has been made, the active
alarm should clear itself (see reset condition above). Operate the unit through the appropriate modes to see if
any active alarm occurs. Continue with the steps below as necessary.
1
Check 1EVCON
a. Inspect evaporator fan contactor
coil and terminals
No damage to coil
No damage or corrosion.
b. Check coil resistance
Cannot be opened (infinite ohms); Shorted (Zero
Ohms) or shorted to ground
c. Check amp draw of coil
Use ammeter.
2
Check 1EVCON Current Draw
Use Component Test Mode to test
actual current draw of the circuit.
(Refer to Section 5.2.2.)
Refer to Section 2.12 for correct electrical values.
View current draw in Data List.
3
Check 1EVCON Wiring
Inspect harness & control box
connector pins & terminals (See wir-
ing schematic Section 10.)
No physical damage to harness.
No damage, moisture, or corrosion in connectors.
