Friedrich 9 User Manual
Page 17
15
ELECtRonIC ContRoL ERRoR CoDES DIagnoStICS anD
TeST MODe (Continued)
The chart below lists the possible error codes and their description:
Error
Code
Code Translation
Action Taken by Unit
Possible Cause
EF
“Error Free” - No Codes Stored
None
Unit Operating Normally
02
An extreme low voltage condition
exists <198V for 230V units and
<239V for 265V units.
Shut down unit. Display Error code and
flash. 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. Alternately
flash 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. Alternately flash
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. Alternately flash
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° F for
2 consecutive minutes. (Heat Pump
models only)
Alternately flash 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 flow
• Non-condensables in refrigeration system
07
I.D coil temperature <30° F for 2
consecutive minutes.
Alternately flash set point and error
code. Continue fan operation while the
compressor is locked out until the indoor
coil thermistor reaches 45° F, then energize
the compressor. However, compressor
must still wait a lockout time of 180 to 240
seconds.
• Dirty filters
• Dirty coil
• Fan motor failure
• Restricted airflow
• Improper refrigerant charge
• Restriction in refrigerant circuit
08
Unit cycles (Heat or Cool demand) >
9 times per hour
Store error code in memory.
Keep unit running
• Unit oversized
• Low load conditions
09
Unit cycles (Heat or Cool demand) <
3 times per hour
Store Error Code in memory.
Keep unit running
• Unit undersized
• High load conditions
10
Room Freeze Protection triggered
Alternately flash set point and error code.
Keep unit running.
• Room temperature fell below 40°F
11
No Signal to “GL or “GH” terminal
Shut down unit. Display error code and
flash.
• Defective remote thermostat
• Defective thermostat wiring
13
VPAK
24K BTUs
ONLY
High Pressure switch open
Turn OFF compressor. Flash error code
• Dirty coil
• Fan motor failure
• Restricted air flow
• Non-condensables in refrigeration system
Diagnostics
The Friedrich Smart Center continuously monitors the VPAK 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 sec-
onds. If error codes are present they will be displayed. If multiple codes exist you can toggle between messages
using the temp up button. To clear all codes press the temp down button for three seconds while in the error code
mode. To exit without changing codes press the
‘Low Fan’ button.
test mode
For service and diagnostic use only, the built-in timers and delays on the VPAK 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 en-
tering 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.