Carrier 38BNB Owner's Manual page 11

On each Malfunction, Indicator Light (red) will flash at a constant rate:
40BN018,024 AND 030
40BN018,024 AND 03040BN036
Malfunction Indication Display
For 40BN036 the malfunction can be read by the rate of the flashing light on the control. (Raise the front grille list.)
For 40BN018,024,030 the malfunction can be read without raising the front grille by the rate of the flashing service light.
Malfunction Display Light
TH1 Malfunction • 1 short flash
TH2 Malfunction • 2 short flashes
Low Pressure Malfunction • 3 short flashes
High Pressure Malfunction • 4 short flashes
Low Voltage Malfunction • 5 short flashes
High Voltage Malfunction • 6 short flashes
Fig. 16 — Malfunction Displays
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40BN036