Digital Control Diagnostics And Test Mode - Friedrich PTAC Installation & Operation Manual

Digital Control Diagnostics and Test Mode

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
all codes press the temp
the error code mode. To exit without changing codes press the
'Low Fan' button.
The chart below lists the possible error codes and their description:
Error
Code Translation
Code
01
NOT USED
An extreme low voltage condition
02
exists <198V for 230V units and
<239V for 265V units.
Return air thermistor sensor open
03
or short circuit
Indoor coil thermistor sensor open
04
Or short circuit
Outdoor coil thermistor sensor
05
open Or short circuit
If O.D. coil Temperature > 175 Deg
06
F for 2 consecutive minutes. (Heat
Pump models only)
I.D coil temperature <30 Deg F for
07
2 consecutive minutes.
10
Room Freeze Protection triggered
24
button. To clear
button for three seconds while in
NONE
Shut down unit. Display Error code and fl ash.
Once voltage rises to normal level system power
is restored.
Set return air sensor = 75
point and error code. Leave unit running.
Set ID coil temp = 40
and error code. Leave unit running.
Set OD coil temp = 20
and error code. Automatically change over to
Electric heat Mode only. Leave unit running.
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.
Alternate fl ash set point and error code. Continue
fan operation while the compressor is locked out
until the indoor coil thermistor reaches 45° F, and
then energize the compressor. However, com-
pressor must still wait a lockout time of 180 to 240
seconds.
Alternate fl ash set point and error code. Keep unit
running.
920-087-04 (8-05)
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.
Action Taken by Unit
°
F. Alternate fl ash set
°
F. Alternate fl ash set point
°
F. Alternate fl ash set point
Possible Cause
• Inadequate power supply
• Defective breaker
• Blown fuse
• Defective sensor
• Defective sensor
• Defective sensor
• Dirty coil
• Fan motor failure
• Restricted air fl ow
• Non-condensables in
refrigeration system
• Dirty fi lters
• Dirty coil
• Fan motor failure
• Restricted airfl ow
• Improper refrigerant charge
• Restriction in refrigerant circuit
• Room temperature fell below 40°F