UHM-DHM-SF-1H 35
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
between 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
operate 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.
LED DESCRIPTION FUNCTION
GREEN STATUS LED FAST FLASH - CALL FOR HEAT
SLOW FLASH - NO CALL FOR HEAT
RED ALERT LED NO. OF FLASHES
- SEE DIAGNOSTIC CODES
GREEN
(BM)
BITMASTER ON SOLID WHEN UNIT POWERED
AMBER COM FLASHES DEVICE COUNT
IFC BOARD
Line voltage
connections
"Com" LED
(Amber)
Bitmaster (BM)
LED (Green)
24V furnace
component
connections
Low voltage
terminal board
5 Amp control
fuse
BK jumper
Neutral
connections
Motor bus
connections
User Interface
connection
Status LED
(Green)
Personality
module
connection
Fault LED
(Red)
Motor bus
connections
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