Digital-Controls Troubleshooting; Maintenance; Return-Air Filter - Dometic AH-Passport I/O Compact Operation Manual

AH-Passport I/O Control Operations Manual
D -C
IGITAL ONTROLS
See also "General Troubleshooting" on page 12.
Table 4: Digital-Controls Troubleshooting
PROBLEM
Digital display panel is not
lit.
Fan is not running or runs
continuously.
Fan is not running but a
cooling/heating demand
exists.
Fan runs continuously
although it is set to cycle
with cooling/heating
demand.
No cooling or heating.
System runs continuously.
"ASF" is displayed.
(Air Sensor Failure)
"FIL" is flashing
(Filter Reminder)

MAINTENANCE

R -A
ETURN IR
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.
L-2232 ENGLISH
T
ROUBLESHOOTING
POSSIBLE REASON/SOLUTION
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.
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.
Failed triac on circuit board. Send for repair or call local service technician.
Failed triac on circuit board. Send for repair or call local service technician.
Digital control programmed for heat or cool only. Reprogram parameter P-1.
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.
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.
Filter needs to be cleaned or replaced. Clean or replace filter, and reset P-21 to "00".
F
ILTER

Digital-Controls Troubleshooting

13