Error Code #
Description
05
Outdoor sensor (direct wired) temperature reading is out of normal operating range. The
sensor circuit may be open or shorted, the processor control board may be out of calibra-
tion, or there may be an incorrect value in L035.
06
Outdoor sensor temperature from the transmitting device (PLC system) is out of normal
operating range. Check the outdoor sensor attached to the transmitting device and the
transmitter for proper operation.
07
Main 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.
08
Currently not utilized.
09
Currently not utilized.
10
Outlet water temperature has exceeded the maximum standard operating temperature.
20
There is no communication occurring between the Base I/O board and the processor
control board. This can be caused by a defective board interface cable or an unresponsive
Base I/O board.
21
There is no communication occurring with the first relay expansion board. The board
interface cable may be defective or the first expansion board may be unresponsive.
22
There is no communication occurring with the second relay expansion board. The board
interface cable may be defective or the second expansion board may be unresponsive.
23
There is no communication occurring with the Steffes time clock module.
24
Temperature sensor offset/reference is out of range and indicates one of the sensors is
shorted to ground, the processor control board is out of calibration, or the blower/control
circuit is connected to an improper input voltage.
25
Power line carrier system is active; however, no good data has been received.
26
Insufficient main control board memory. Contact a qualified service technician.
27
Insufficient permanent memory. Contact a qualified service technician.
28
Permanent memory change has been made. Press the M button to accept. This error
message indicates a change has been made to the software program; therefore, it is
important to verify that all location settings are correct for the application.
29
On-board communication system is not fully operable. Contact a qualified service techni-
cian.
30
Base I/O control board is in test mode. Check the jumper configuration.
31
Relay expansion board(s) are in test mode. Check the jumper configuration.
39
Indicates the value in Location 13 (L013) has been set to a value greater than the value in
Location 12 (L012). The system will not charge until the value in L013 is set lower than
L012.
40
Press and release the M button to clear the error. If the error code reappears, contact a
qualified service technician.
41
Contact a qualified service technician.
42
Contact a qualified service technician.
43
Contact a qualified service technician.
44
Contact a qualified service technician.
Cold Core
Temperature of the brick core is below 40 degrees or the core sensing thermocouple may
be open.
Core Fail
Core high limit switch may be open.
PLC Fail
The system is configured for power line carrier control; however, is not receiving a valid
power line carrier communication signal.
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Comfort Plus Hydronic
Appendix
A.10
