Electronic Control Error Code Diagnostics; Test Mode - Friedrich PTAC series Service Manual

Electronic Control Error Code Diagnostics

Error
C o d e T a r n l s t a
Code
F F
E E r r r o e r e
An extreme low voltage condition exists <198V
02
for 230V units and <239V for 265V units.
Return air thermistor sensor open or
03
short circuit
Indoor coil thermistor sensor open or
04
short circuit
Outdoor coil thermistor sensor open
05
or short circuit
Outdoor coil Temperature > 175° F for
06 2 consecutive minutes. (Heat Pump
models only)
Indoor coil temperature <30° F for 2
07
consecutive minutes.
Unit cycles (Heat or Cool demand) >
08
9 times per hour
Unit cycles (Heat or Cool demand) <
09
3 times per hour
Room Freeze Protection triggered
10
No Signal to "GL or "GH" terminal
11
12 Discharge air temperature >185° F
Pressure switch jumper wire loose/missing
13
High Pressure switch open (If so equipped)
Discharge air temperature sensor open or
14
shorted
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.
EF = Error Free
16
o i n A t c o i n T a k e n B y U n t i
N
o n e
Shut unit down. Flash error code.
voltage rises to adequate level normal unit
operation is restored.
Leave unit running. Alternately flash error
code and set point.
Leave unit running. Alternately flash
error code and set point.
Leave unit running. Switch to Electric Heat
Mode (Heat Pump only). Alternately flash
error code and set point.
Shut unit down for 5 minutes, Alternately
flash error code and set point, then try again
2 times, if unit fails the 3rd time then shut
unit down and alternately flash error code
and set point.
Shut down Compressor, and continue fan
operation. Alternately flash error code and
set point until the indoor coil thermistor
reaches 45° F. Then, (after lockout time of
180 to 240 seconds expires), re-energize
the compressor .
Leave unit running. Store error code in
memory.
Leave unit running. Store Error Code in
memory.
Leave unit running. Alternately flash error
. t
c o d e a n d s t e p o n i
Shut unit down. Flash error code.
Shut down Compressor and/or Heater, and
energize high fan. Alternately flash error
code and set point. If condition repeats
three times in one hour, shut unit down.
Shut unit down. Flash error code.
Leave unit running. Alternately flash error
code and set point.

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. CE will be displayed
when entering test mode, and OE 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.
Note:
To access the Test Mode while under remote wall
thermostat operation, remove thermostat's wires
at the terminal block on the electronic control
board then connect a jumper wire between GL
and GH.
P o s s b i e l C a u s e
U N y l l
n t i O p r e t a n i g r o m a
When • Inadequate power supply
• Defective breaker
• Blown fuse
• Defective sensor
• Defective sensor
• Defective sensor
• Dirty coil
• Fan motor failure
• Restricted air flow
• Non-condensables in refrigeration sys
• Dirty filters
• Dirty coil
• Fan motor failure
• Restricted air flow
• Improper refrigerant charge
• Restriction in refrigerant circuit
• Unit oversized
• Low load conditions
• Unit undersized
• High load conditions
•
R o o m e t m p e a r u t e r f l l e
• Defective remote thermostat
• Defective thermostat wiring
• Restricted air flow
• Fan motor failure
• Dirty coil
• Fan motor failure
• Restricted air flow
• Non-condensables in refrigeration system
• Defective Sensor
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