62-11637 7–34
00067 SENSOR 1 INPUT VOLTAGE LOW
• This alarm may be activated with earlier software versions. Follow procedure for Alarm 22101 SENSOR
INPUT VOLTAGE LOW INP1.
00072 CHECK ENCU POWER CIRCUIT
• This alarm may be activated with earlier software revisions, follow procedure for alarm 05012 CHECK
ENCU POWER CIRCUIT.
00078 CHECK SV1 CIRCUIT
• ACTIVATION: A problem has been detected in the SV1 coil circuit. If this alarm is activated while the unit is
operating in heat or defrost, the circuit is detected shorted. If this alarm is activated while the unit is operat-
ing in cool, the circuit is detected open.
• UNIT CONTROL: Alarm only.
• RESET CONDITION: Auto reset when the control system calls for SV1 to energize (heat, defrost or pulse)
and the SV1 coil circuit is normal, or when the control system calls for SV1 to be de-energized (cooling) an
the circuit is not shorted or Alarm may be manually reset using the display mounted keys 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.
CORRECTIVE ACTIONS:
1. Check for Additional Alarms
If this alarm is activated in conjunction with other alarms (00031, 00072, 00079, 00080, 00085 or 000
86) check F5 & F10. Fuses must be good. Replace fuse(s) as required, clear alarms, restart and
check for repeat alarm(s).
2. Check Coil
a. Inspect coil & connector pins & terminals. Verify no damage to coil. No damaged or corroded pins.
b. Check resistance of coil. Refer to Section 2.10 for specifications.
c. Use Component Test Mode (Refer to Section 5.2.4) to test actual current draw of the circuit. Refer to
Section 2.10 for specifications. Verify the actual current is within the specifications.
3. Check Power and Wiring
a. Use Component Test Mode (Refer to Section 5.2.4) to energize circuit. Check for power at SV1 termi-
nal A and 3MM-1. Minimum 11 VDC. If not, check connectors and wiring between terminals. Verify no
damage, moisture or corrosion.
b. Check for ground at SV1 terminal B (including SP-3) to GND RING1. Good ground. If not, check con-
nectors and wiring between terminals. Verify no damage, moisture or corrosion.
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