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Before Calling for Service
Save the cost of a service call by doing the following:
1. Be sure main power to system is turned on.
2. Press Mode button until OFF is displayed. Wait 5 minutes.
3. Press Mode button until either COOL or HEAT is displayed
(as desired).
4. Adjust thermostat set point to desired room temperature. If
system starts within a few minutes, service may not be ne-
cessary. If system does not operate properly, check Table 14
for typical solutions.
IF SYSTEM FAILS TO OPERATE — Be sure:
S unit ON/OFF switch is in ON position
S fuse or circuit breaker is not tripped
FRESH AIR INSTALLATION OPTION
The units have an installation option, which allows for field
installation of fresh air ventilation. Plan the installation carefully.
Before beginning, measure carefully and follow acceptable
building practices, NEC, and local codes.
Ventilation--Air Accessory — Refer to ventilation air accessory
installation instructions.
TROUBLESHOOTING
If the under--ceiling fan coil unit fails to start or operate properly, sometimes the problem is minor and can be handled without a service call.
Referto Table 14 for some common problems, causes, and typicalsolutions. See Fig. 36 and 37 for additional system troubleshooting details.
If the problem cannot be corrected, contact a local dealer for further assistance.
Table 14 – Troubleshooting
PROBLEM CAUSE TYPICAL SOLUTION
SystemDoes NotStart.
Blown fuse or circuit breaker tripped at building power
entry.
Replacefuseorresetcircuitbreaker.*
Indoor and/or outdoor unitdisconn ect switch isof f. Turn on disconnect switch(es).
Thermostat is set to night mode. Cancel mode using Day/Nightbutton onthermostat.
Power failure. Restore power.
Unit is in off mode.
Press Mode button on thermostat until thermostat dis-
plays the desiredunitmode.
Three---minute time delay isrunning. Wait for 3minutes.
Temperature is above or below the selected temperat-
ure.
Select new temperatureusingthe thermostat.
SystemDoes Not Cool Properly.
Air filter(s) in indoor unit is dirty or needs to be replaced. Clean or replace air filter(s).
Temperature is set too high or too low.
Resettemperature to desiredcomfortsettingusing the
thermostat.
Outdoor unit outdoor coil restricted. Remove obstruction.
Fan speed is set too low.
Adjust fan speed to high or auto. using the F an button
on the thermostat.
SystemDoes notHeat Properly.
Air filter(s) in indoor unit is dirty or needs to be replaced. Clean or replace air filter(s).
Temperature is set too high or too low.
Resettemperature to desiredcomfortsettingusing the
thermostat.
Outdoor unit outdoor coil restricted. Remove obstruction.
Fan speed is set too low.
Adjust fan speed to high or auto. using the F an button
on the thermostat.
Outdoor unit outdoor coil isfrostedup.
Check manual defrost timer settingand adjust asn e-
cessary.
Ice or frosthasFormed on Indoor
Coil.{
Low outdoor--- air temperature. Runsysteminfan---onlymodeuntilfrostisgone.
Air filter(s) in indoor unit is dirty or needs to be replaced. Clean or replace air filter(s).
Insufficient Airflow.
Air filter(s) in indoor unit is dirty or needs to be replaced. Clean or replace air filter(s).
Fan coil unitcoil is blocked. Clean air discharge louvers.
* If fuse blowsor circuitbreaker tripsa gain after first start attempt,DO NOT attempt tostart systemagain. Contact your local dealer forassistance.
† When outdoor temperatureisapproximately55_F (12.8_C) or below, indoor coil frosting may occur when system is operated in cooling or maximum
dehumidification mode. Units are not intended to operate below 55_F (12.8_C) without appropriate accessories.
40QAC/38HDR -- 40QAQ/38QR
R