UHA S
TANDARD
U
NIT
H
EATER
I
NSTALLATION
O
PERATION AND
S
ERVICE
M
ANUAL
36 of 59
Figure 16: LED Diagnostic Codes
LED INDICATION FAULT MODE
Slow Flash
Normal Operation - No call for heat.
Fast Flash
Normal Operation - Call for heat.
2 Flashes
Ignition Lockout - No flame detected.
3 Flashes
Airflow Fault - Pressure switch open or closed.
4 Flashes
Temperature Limit Switch Open
5 Flashes
Flame Sense Error - Gas valve not energized.
Steady On
Internal Control Failure
Summary of Contents for UHAT 150
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Page 50: ...UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 42 of 59 14 1 General...
Page 65: ...SECTION 16 SPECIFICATIONS 57 of 59 16 4 Dimension Data for Models UHA T M X S 300 400...
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