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Service Facts
ALERT CODE RECOVERY
On power up, last 4 Alerts, if any, will be flashed on the
Red Alert LED. The newest Alert detected will flash first
and the oldest last. There will be a 2 second delay be-
tween Alert Code flashes. Solid Red LED error codes will
not be displayed.
The Green BM LED will be on solid when the control is
powered. The Green status LED indicator light will oper-
ate as shown in the table and the Red LED will flash (one
flash) every 20 seconds.
NOTE:
Use the flash code menu for detail of the alerts. Alert
codes also are displayed on the User Interface menu
using a descriptive text message and on the comfort
control display using an alert code number. A com-
plete list of the alert codes is included with the comfort
control.
Line voltage con-
nections
"Com" LED
(Amber)
Bitmaster (BM)
LED (Green)
24V furnace com-
ponent connec-
tions
Low voltage
terminal board
5 Amp control
fuse
BK jumper
36
LED
DESCRIPTION
GREEN
STATUS LED
RED
ALERT LED
GREEN
BITMASTER
(BM)
AMBER
COM
IFC BOARD
FUNCTION
FAST FLASH - CALL
FOR HEAT
SLOW FLASH - NO
CALL FOR HEAT
NO. OF FLASHES
- SEE DIAGNOSTIC
CODES
ON SOLID WHEN UNIT
POWERED
FLASHES DEVICE
COUNT
Neutral connections
Motor bus
connections
Motor bus
connections
User Interface
connection
Status LED
(Green)
Personality
module con-
nection
Fault LED
(Red)
UHM-DHM-SF-1V-EN
- Quick Links:
- Product Specifications
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