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

Shut down unit. Display Error code and

• Inadequate power supply

 

exists <198V for 230V units and

￿ash. Once voltage rises to normal level

• Defective breaker

 

<239V for 265V units.

system power is restored.

• Blown fuse

 

 

 

 

03

Return air thermistor sensor open or

Set return air sensor = 75°F. Alternately

• Defective sensor

 

short circuit

￿ash set point and error code. Leave unit

 

 

 

running.

 

 

 

 

 

04

Indoor coil thermistor sensor open or

Set ID coil temp = 40°F. Alternately ￿ash

• Defective sensor

 

short circuit

set point and error code. Leave unit running.

 

 

 

 

 

05

Outdoor coil thermistor sensor open

Set OD coil temp = 20°F. Alternately ￿ash

• Defective sensor

 

or short circuit

set point and error code. Automatically

 

 

 

change over to Electric heat Mode only.

 

 

 

Leave unit running.

 

 

 

 

 

06

If O.D. coil Temperature > 175° F for

Alternately ￿ash set point and error code.

• Dirty coil

 

2 consecutive minutes. (Heat Pump

Shut unit down for 5 minutes, then try again

• Fan motor failure

 

models only)

2 times, if fails the 3rd time then shut down

• Restricted air ￿ow

 

 

unit.

Non-condensables in refrigeration system

 

 

 

 

07

I.D coil temperature <30° F for 2

Alternately ￿ash set point and error

• Dirty ￿lters

 

consecutive minutes.

code. Continue fan operation while the

• Dirty coil

 

 

compressor is locked out until the indoor

• Fan motor failure

 

 

coil thermistor reaches 45° F, then energize

• Restricted air￿ow

 

 

the compressor. However, compressor

• Improper refrigerant charge

 

 

must still wait a lockout time of 180 to 240

• Restriction in refrigerant circuit

 

 

seconds.

 

 

 

 

 

08

Unit cycles (Heat or Cool demand) >

Store error code in memory.

• Unit oversized

 

9 times per hour

Keep unit running

• Low load conditions

 

 

 

 

09

Unit cycles (Heat or Cool demand) <

Store Error Code in memory.

• Unit undersized

 

3 times per hour

Keep unit running

• High load conditions

 

 

 

 

10

Room Freeze Protection triggered

Alternately ￿ash set point and error code.

• Room temperature fell below 40°F

 

 

Keep unit running.

 

 

 

 

 

11

No Signal to “GL or “GH” terminal

Shut down unit. Display error code and

• Defective remote thermostat

 

 

￿ash.

• Defective thermostat wiring

 

 

 

 

13

High Pressure switch open

Turn OFF compressor. Flash error code

• Dirty coil

VPAK

 

 

• Fan motor failure

24K BTUs

 

 

• Restricted air flow

ONLY

 

 

 

 

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.

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Friedrich 9, 000 BTU'S service manual Electronic control error codes diagnostics and test mode, Diagnostics, Test Mode