Maintenance; Return-Air Filter - Dometic AH-Elite Control Operation Manual

AH-Elite 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-2229 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 set for either fan cycling with cooling/heating demand or
continuous fan operation. Press and hold the Fan button for five seconds to change the
fan operation to cycled ("CYC") or continuous ("con"). Note: When configured for electric
heat, after a heat cycle ends the fan will stay on for 4 minutes even if the fan is set to
cycled operation.
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.
1. Digital control programmed for heat or cool only. Press Mode button to achieve
desired mode.
2. Chilled-water loop is inadequately cooled or heated, chiller system is not in the
proper mode of operation, or Electric Heater is disabled. If the air handler system
is equipped with water-temperature sensors, check the water temperature at the
digital control by pressing the Up and Power buttons simultaneously while in On
mode. If the water temperature is not at least 15°F warmer (for heat mode) or cooler
(for cool mode), the water valve will not open. See "Temperature Differential of Air &
Water" on page 11 and the P-19 programmable parameter for more information. If the
air handler system is equipped with an electric heater, ensure that programmable
parameter P-15 is set to "ELE".
Improper air sensor location. Verify display head location with criteria found in the
control manual. Install alternate air sensor if necessary.
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 cleaning or replacement.
Clean or replace filter, and reset P-19 to "00".
F
ILTER
Digital-Controls Troubleshooting
13