Honeywell S9371A - Manual (Page 15)

S9360A, S9361A, S9370A, S9371A INTEGRATED BOILER CONTROLLERS
15 69-2076—01
Table 7. Error Codes.
Segment
Display Definition
Pressure Switch failed to open (contacts stuck closed).
Flame sensed out of normal sequence (before opening gas valve or after
closing gas valve).
Flame sensed during prepurge (before gas valve signaled opened).
Flame sensed during postpurge (before gas valve signaled closed).
Pressure Switch failed to close (contacts stuck open).
Sensor 2 Error. Temperature sensor or interface failure (open or short
connection) or failure of A/D conversion (invalid offset).
Sensor 1 Error. Temperature sensor or interface failure (open or short
connection, increased connection resistance, dual sensor mismatch) or
failure of A/D conversion (invalid offset or gain, too many failures during
A/D conversion).
Atmospheric Damper End Switch failed to close (end switch contacts stuck
open).
Atmospheric Damper End Switch failed to open (end switch contacts stuck
closed).
Flame Rod shorted to burner ground.
AC line frequency error—signal is too noisy or frequency is incorrect.
Line voltage error—voltage out of spec high or low.
Line voltage unstable—possibly too many heavy loads switching on and
off cause erratic supply voltage.
Soft Lockout—maximum number of retries exceeded.
Soft Lockout—maximum number of recycles exceeded.
Soft Lockout—electronics failure. Caused by general electronics failure
such as relay open or shorted contacts, flame sensing circuit error, or A to
D error.
Over temperature error. Sensors measured temperature in excess of ECO
limit.