13
Diagnostics
The Friedrich Smart Center continuously monitors the PTAC
unit operation and will store service codes if certain conditions
are witnessed. In some cases the unit may take action and
shut the unit off until conditions are corrected.
To access the error code menu press the ‘Heat’ and ‘High
Fan’ buttons simultaneously for three seconds. If error codes
are present they will be displayed. If multiple codes exist you
can toggle between messages using the temp
button. To
clear all codes press the temp button for three seconds
while in the error code mode. To exit without changing codes
press the ‘Low Fan’ button.
ERROR
CODE
CODE TRANSLATION ACTION TAKEN BY UNIT POSSIBLE CAUSE
01
NOT USED NONE
02
An extreme low voltage condition
exists <198V for 230V units and
<239V for 265V units.
Shut down unit. Display Error code and fl ash.
Once voltage rises to normal level system
power is restored.
• Inadequate power supply
• Defective breaker
• Blown fuse
03
Return air thermistor sensor open
or short circuit
Set return air sensor = 75
°
F. A l te r nate fl ash set
point and error code. Leave unit running.
• Defective sensor
04
Indoor coil thermistor sensor open
Or short circuit
Set ID coil temp = 40
°
F. A l te r nate fl ash set
point and error code. Leave unit running.
• Defective sensor
05
Outdoor coil thermistor sensor
open Or short circuit
Set OD coil temp = 20
°
F. A l te r nate fl ash set
point and error code. Automatically change
over to Electric heat Mode only. Leave unit
running.
• Defective sensor
06
If O.D. coil Temperature > 175 Deg
F for 2 consecutive minutes. (Heat
Pump models only)
Alternate fl ash set point and error code. Shut
unit down for 5 minutes, then try again 2 times,
if fails the 3rd time, then shut down unit.
• Dirty coil
• Fan motor failure
• Restricted air fl ow
• Non-condensables in
refrigeration system
07
I.D coil temperature <30 Deg F for
2 consecutive minutes.
Alternate fl ash set point and error code.
Con-
tinue fan operation while the compressor
is locked out until the indoor coil thermistor
reaches 45° F, and then energize the com-
pressor. However, compressor must still wait
a lockout time of 180 to 240 seconds.
• Dirty fi lters
• Dirty coil
• Fan motor failure
• Restricted airfl ow
• Improper refrigerant charge
• Restriction in refrigerant circuit
08
If unit cycles (Heat or Cool
demand)> 9 times per hour
Alternate fl ash set point and error code. Keep
unit running.
• Unit oversized
• Low load conditions
09
If unit cycles (Heat or Cool
demand)< 3 times per hour
Alternate fl ash set point and error code. Keep
unit running.
• Unit undersized
• High load conditions
10
Room Freeze Protection triggered
Alternate fl ash set point and error code. Keep
unit running.
• Room temperature fell below
40
°
F
Test Mode
For service and diagnostic use only, the built-in timers and
delays on the PTAC may be bypassed by pressing the ‘Cool’
and ‘Low Fan’ buttons simultaneously for three seconds while
in any mode to enter the test mode. TE will be displayed when
entering test mode, and DE will be displayed when exiting.
The test mode will automatically be exited 30 minutes after
entering it or by pressing the ‘Cool’ and ‘Low Fan’ buttons
simultaneously for three seconds.
DIGITAL CONTROL DIAGNOSTICS AND TEST MODE
The chart below lists the possible error codes and their description:
To Next Page
Loading...
Need help?
General
