AH-Passport I/O Control Operations Manual
Digital-Controls Troubleshooting
L-2232 ENGLISH
13
D
IGITAL
-C
ONTROLS
T
ROUBLESHOOTING
See also “General Troubleshooting” on page 12.
MAINTENANCE
R
ETURN
-A
IR
F
ILTER
Check the return-air filter about once a month and clean as necessary. To clean the filter, remove it from the unit, rinse with
water, air dry and reinstall.
Table 4: Digital-Controls Troubleshooting
PROBLEM
POSSIBLE REASON/SOLUTION
Digital display panel is not
lit.
The 8-pin display-cable plugs are not making contact (unplugged, dirty, bent, or
broken pins).
With POWER OFF at the circuit breaker, remove connector and inspect. If
damaged, replace connector or entire display cable.
Fan is not running or runs
continuously.
Digital control is programmed for either fan cycling with cooling/heating demand
or continuous fan operation.
Reprogram parameter P-14. Note: After the unit cycles
off, the fan will continue to run for two minutes in Cool Mode and four minutes in Heat
Mode regardless of parameter setting.
Fan is not running but a
cooling/heating demand
exists.
Failed triac on circuit board.
Send for repair or call local service technician.
Fan runs continuously
although it is set to cycle
with cooling/heating
demand.
Failed triac on circuit board.
Send for repair or call local service technician.
No cooling or heating.
Digital control programmed for heat or cool only.
Reprogram parameter P-1.
System runs continuously.
Improper air sensor location.
Verify display head location with criteria found in the
control manual. Install alternate air sensor if necessary. Ensure the control display is
located out of direct sunlight and away from open doors or hatches. Or, if using an
alternate air sensor, ensure the sensor is located directly in the system’s return-air path to
obtain an accurate reading.
"ASF" is displayed.
(Air Sensor Failure)
1.
Indicates failed face plate air sensor, alternate air sensor or display cable.
Unplug alternate air sensor if installed or plug in alternate air sensor if not installed.
Try another display cable.
2.
Damaged jack/socket in display head or on circuit board.
Visually check to see
that pins inside socket are not bent or corroded. Repair or replace display or circuit
board if needed.
"FIL" is flashing
(Filter Reminder)
Filter needs to be cleaned or replaced.
Clean or replace filter, and reset P-21 to "00”.
