38 UHM-DHM-SF-1H
Service Facts
RED LED FLASH ERROR
2 External Lockout (3 Retries or 11 Recycles Exceeded)
3 Pressure Switch or Inducer Error
4 Open High, Auxiliary, or Roll-out Limit Switch
5 Flame Sensed When No Flame Should Be Present
6
Earth Ground Not Detected or Poor, Reversed Polarity,
Igniter or Triac Error
7
External Gas Valve Circuit Error (Voltage present when
it should not be)
8 Low Flame Sensor (Less than 1 dc micro-amp)
9 Open Inducer Limit
10
Communiction Error (Loss of communication between
comfort control & furnace control)
SOLID RED
Internal Gas Valve Circuit Error (Damaged furnace
control)
SOLID RED
SOLID STATUS
Continuous Reset Caused by an Internal Error
(Damaged furnace control)
RED OFF
STATUS OFF
24VAC Fuse Open (Short circuit or high secondary
load)
LED Flash Codes
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