23

BeforeCalling for Service

Savethe cost of a service callby doing the following:
1. Be sure main power to system is turned on.
2. Press Mode button untilOFF is displayed. Wait5 minutes.
3. Press Mode button until eitherCOOL orHEAT is displayed
(asd esired).
4. Adjust thermostatset point to desired room temperature.If
system starts within a few minu tes, service may not be ne-
cessary.Ifsystem does not operate properly,check Table 14
fortypical solutions.
IFSYSTEM FAILS TO OPERATE— Be sure:
Sunit ON/OFF switch is in ON position
Sfuseor circuitbreaker is not tripped

FRESH AIR INSTALLATIONOPTION

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 cod es.
Ventilation--Air Accessory — Refer to ventilation air accessory
installation instructions.
TROUBLESHOOTING
Ifthe under--ceilingfan coil u nit fails to start or operate properly, sometimes the problem is minor an d can be handled without a service call.
Referto Table14 for some common problems, causes,and typical solutions.See Fig. 36 and 37 for additionalsystem troubleshootingdetails.
Ifthe problem cannot be corrected,contact a localdealer for further assistance.
Table14 – Troubleshooting
PROBLEM CAUSE TYPICALSOLUTI ON
SystemDoes Not Start.
Blown fuse or circuit break er tripped at building pow er
entry. Replacefuseorresetcircuitbreaker.*
Indoorand/or outdoor unit disconnect switch isoff. Turnon discon nect switch(es).
Thermostat is set to night mode. Cancelmode usingDay/Night button on thermostat.
Power failu re. Restorepower.
Unitis in offm ode. PressMode button ontherm ostat until thermostat dis-
playsthe desiredunit mode.
Three---minutetimedelay is running. Waitfor 3 minutes.
Temperatureis above or be low the selected temperat-
ure. Selectnew temperatureusing the thermostat.
SystemDoes Not Cool Properly.
Airfil ter(s) in indoor unit is dirty or nee dst o ber eplaced. Cleanor replace air filter(s).
Temper atu re is set t oo hig h or too l ow. Resettemperature to desiredcomfort setting usingthe
thermostat.
Outdoorunit outdoorcoil restricted. Removeobstr uction.
Fan speed is set too l ow. Adjustfan speed to high or au to. using the Fan button
onthe the rmostat.
SystemDoes not Heat Properly.
Airfil ter(s) in indoor unit is dirty or nee dst o ber eplaced. Cleanor replace air filter(s).
Temper atu re is set t oo hig h or too l ow. Resettemperature to desiredcomfort setting usingthe
thermostat.
Outdoorunit outdoorcoil restricted. Removeobstr uction.
Fan speed is set too l ow. Adjustfan speed to high or au to. using the Fan button
onthe the rmostat.
Outdoorunit outdoorcoil is frostedup. Checkmanualdefrost timer settingand adjust as ne-
cessary.
Iceor frost has Formedon Indoor
Coil.{
Lowoutdoor---airtemperature. Runsysteminfan---onlymodeuntilfrostisgone.
Airfil ter(s) in indoor unit is dirty or nee dst o ber eplaced. Cleanor replace air filter(s).
Insufficient Airflow. Airfil ter(s) in indoor unit is dirty or nee dst o ber eplaced. Cleanor replace air filter(s).
Fancoil unit coil is blocked. Cleanair discharge louvers.
* Iffuseblows or circuit breaker tripsagain after first start attempt, DO NOT attempt to start systemagain. Contact your local dealer for assistance.
† Whenoutdoortemperatureis approximately55_F (12.8_C) or be low, indoor coil frosting may occu r when system is operated in cool ing or maximum
dehumidification mode. Unit sa re not intended to opera te below 55_F (12.8_C) without appropriate accessories.
40QAC/38HDR -- 40QAQ/38QR
R