HELP MENU
The Comfort Plus contains a Help Menu which may be accessed through the control panel. To access the Help
Menu, press and release the M button until the faceplate displays “HELP”. Scroll through the menu by pressing
either the up or the down arrow button.
Display
Reading Description
Fxxx Firmware Version Number - Indicates the version of software installed.
O xx Outdoor Temperature - Indicates current outdoor temperature as recognized by the system.
tL:xx Target Level - Indicates the percentage of brick core charge level the system is targeting. During
peak periods the value displays as "tL_".
CL:xx Charge Level - Indicates the percentage of heat storage currently in the brick core.
HE x Heating Elements Active - Indicates the total number of heating elements currently energized.
PC x Power Line Carrier Channel - Indicates the channel on which the system is set to receive PLC
communication signal.
P x Power Line Carrier Net Hit Rate Percentage - Indicates the percentage of "GOOD" communica-
tion packets received by the system from the PLC transmitter system.
PS x Indicates which Specialty Timer the system is currently using. The value displayed will be zero if
the Specialty Timer is not being utilized.
CC_x Charge Mode Operation - Indicates the charge control method being utilized during off-peak peri-
ods.
CA_x A-Peak Mode Operation - Indicates the charge control method being utilized during anticipated peak
periods.
C1_x Specialty Timer #1 Charge Mode - Specialty Applications Only.
C2_x Specialty Timer #2 Charge Mode - Specialty Applications Only.
ERROR CODES
The Comfort Plus has an on-board diagnostic system to monitor various operat-
ing conditions. If operating conditions move outside the normal operating range,
an error code is displayed on the faceplate. If there are multiple errors simulta-
neously, only the highest priority error code appears. Once corrected, the next
highest priority code will be displayed on the faceplate as “Er—” (i.e., Er05).
Error Code # Description
01 The lower core (Core A) thermocouple temperature is out
of normal range. An open, shorted, or otherwise defec-
tive thermocouple or a circuit board which is out of
calibration can cause this.
02 The upper core (Core B) thermocouple temperature is out of normal range. This can be
caused by an open, shorted, or otherwise defective thermocouple or a circuit board which is
out of calibration.
03 Room sensor temperature is out of normal range. This can indicate an open thermistor, a
short in the wiring, or a circuit board which is out of calibration.
04 Discharge air sensor temperature is out of normal range. This can indicate an open ther-
mistor, a short in the wiring, or a circuit board which is out of calibration.
05 Outdoor sensor (direct wired) temperature reading is out of normal range. The thermistor
circuit may be open or shorted, the processor control board may be out of calibration, or
there may be an incorrect value in L035.
Appendix A.13 Comfort Plus
Appendix
HAZARDOUS VOLTAGE:
Risk of electric shock,
injury, or death. System
may be connected to more
than one branch circuit.
Disconnect power to all
circuits before servicing.
Equipment must be serviced
by a qualified technician.
WARNING
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