Error Codes - 4200 Series

Error 1

Er01

The brick core sensor temperature is out of normal operating range. An open, shorted, or otherwise defective sensor or a processor control board which is out of calibration can cause this.

Error 2 - 3

Currently not utilized.

Error 4

Er04

Discharge air temperature is out of normal range, 25°F/-4°C to 175°F/79°C.

Indicates a dirty sensor, a sensor that is open, shorted to ground, or a processor control board out of calibration.

Test the sensor by reading resistance (ohms) across the sensor wires. Compare the sensor reading to the actual duct temperature and the value in L112 to verify proper operation. Approximate ohm readings are 60°F/16°C = 1552 ohms; 70°F/21°C = 1199 ohms; 80°F/27°C = 941 ohms.

Verify the discharge air sensor wiring harness is connected properly. The harness runs from the sensor on the supply blower to the Air Sensor terminals on the low voltage expansion board.

Error 5

Er05

Outdoor sensor (direct wired) temperature reading is out of normal operating range. The sensor circuit may be shorted, the processor control board may be out of calibration, or there may be an incorrect value in L035/C004.

Verify values in L020/C003 and L035/C004 have been set appropriately and the outdoor sensor is connected to OS and SC on the low voltage expansion board.

Compare the sensor reading to the value in L113 to verify proper calibration of the processor control board. Approximate ohm readings are 5°F/-15°C = 7,646 ohms; 50°F/10°C = 2,024 ohms; 95°F/35°C = 646 ohms.

Error 6

Er06

Outdoor sensor temperature from the transmitting device (PLC system) is out of normal range. Check the outdoor sensor attached to the transmitting device and the transmitting device itself for proper operation. Verify values in L020/C003 and L035/C004 have been set for the application.

Error 7

Er07

Processor control board temperature sensor is out of normal operating range. Verify that none of the clearances have been violated and inspect the condition of the processor control board.

Error 8 - 19

Currently not utilized.

Error 20

Er20

There is no communication occurring between the base I/O relay board and the processor control board. This may be caused by a defective interface cable or an unresponsive base I/O board.

Error 21 - 22

Currently not utilized.

Error 23

Er23

There is no communication occurring with the Time Clock Module.

Verify the value in L035. If the programming is correct, there may be a loose connection from the low voltage expansion board to the time clock module, a defective interface cable, or a defective time clock module.

Error 24

Er24

The processor control board's temperature sensor offset or reference is out of range.

Indicates that one of the sensors (i.e. direct wired outdoor temperature sensor, discharge air sensor, or brick core temperature sensor) may be shorted to ground or the processor control board may be defective. When this occurs, any temperatures monitored by the processor control board will be unreliable.

Error 25

Er25

See PLC Fail.

Error 26

Er26

Indicates the processor control board had an error on start-up. Reset power to the heating system at the breaker panel. If error persists, replace processor control board.

Error 27

Er27

Indicates the processor control board has an insufficient permanent memory error.

Reset power to the heating system at the breaker panel. If error persists, replace processor control board.

Error 28

Er28

Permanent memory change has been made. Press and release the M button twice to clear the error.

Indicates a change has been made to the software program or the memory has been corrupted; therefore, it is important to verify that all location settings are correct for the application. If the error will not clear or becomes a repeat failure, replace the processor control board.

Error 29

Er29

On-board communication system is not fully operable. Reset power to the heating system. If the error persists, contact Steffes Technical Support.

Error 30

Er30

Base I/O control board is in test mode. J1 and J2 jumpers should both be off in normal operation.

Error 31 - 37

Currently not utilized.

Error 38

Er38

See Core Fail.

Error 39

Er39

The start charge temperature as set in L012/C001 is set to a value lower than the full charge temperature as set in L013/C002. The system will not charge properly when these values are reversed. Set the temperature in L012/C001 to a value greater than the temperature in L013/C002.

Error 40

Er40

Indicates memory corruption has occurred. Press and release the “M” button to clear the error. After clearing the error, it is important to verify that all location settings are correct for the application. If the error will not clear or becomes a repeat failure, replace the processor control board.

Error 41

Er41

An attempt was made to write to the flash memory a second time. This is not permitted unless the system is reprogrammed at the factory. Reference L098 and L099.

Error 42

Er42

The processor control board is unable to load the flash configuration. Replace the processor control board.

Error 43

Er43

An attempt to load a saved configuration using L098 has failed. Any changes to location values will need to be set manually. Press and release the “M” button to clear the error.

Error 44

Er44

The check sum of the chip memory (flash) checksum is corrupt. Replace the processor control board.

Error 45

Er45

An attempt was made to load memory from an unsaved configuration using L098. Any changes to locations values will need to be set manually. The error code will clear after a few minutes.

Error 46

Er46

The MA signal or Pulse Width Modulation has timed out indicating the max load percentage has not been received from any active source for at least 30 minutes. If max load percentage has timed out, the system will revert to normal operation with no load limits applied. If the MA command or Pulse Width Modulation are not being used, verify that L053 and L055 are set correctly for the application.

Error 47

Er47

Currently not utilized.

Error 48

Er48

System is currently in battery backup mode.

Error 49

Er49

No communication with the low voltage expansion board.

Cold Core

The temperature reading of the brick core temperature sensor, L110, is 40°F/5°C or lower. This may indicate cold bricks were installed or an open or defective brick core temperature sensor. If the bricks were installed cold, the error code will disappear once the core reaches a temperature higher than 40°F/5°C. If the brick core is at a temperature higher than 40°F/5°C, verify wiring of the brick core temperature sensor. Verify the values in L090, L091, and L092 are correct for the application.

Core Fail

Low voltage power to the safety relays is not present. This may be caused by an open core charging high limit switch, an open across Limit 1 and Limit 2 on the base I/O relay board, or no 24V power to the low voltage expansion board.

PLC Fail

The heating system is configured for power line carrier (PLC) control and has not received a valid PLC communication signal from the transmitting device for more than 9 minutes when using a fast channel (Channel 3-11) or more than 37 minutes when using a slow channel (Channels 1-2 and 12-15). If the system is showing PLC Fail on the display, it can be a programming issue, a problem with the transmitting or receiving device, or interference with the communication signal between the transmitting device and the receiver.