Filter
Top Products
162
JOHNSON CONTROLS
FORM 100.50-NOM6 (1207)
Service
ALARM CODE DESCRIPTION
24
THE SUPPLY FAN BINARY OUTPUT HAS BEEN TURNED ON FOR 90 SECONDS AND THE AIR PROVING SWITCH
CIRCUIT HAS NOT CLOSED.
25
THE SUPPLY FAN BINARY OUTPUT HAS BEEN TURNED OFF FOR 90 SECONDS AND THE AIR PROVING SWITCH
CIRCUIT HAS NOT OPENED.
26 A MICROELECTRONICS FAILURE HAS OCCURRED AND THE CONTROL IS OPERATING ON DEFAULTS.
27 A MICROELECTRONICS FAILURE HAS OCCURRED AND THE CONTROL IS DOWN DUE TO A FATAL FAULT.
28
THIS INDICATES THE SUPPLY FAN BINARY OUTPUT IS TURNED ON AND THE SUPPLY FAN OVERLOAD CIRCUIT
IS OPEN. THIS HAS TO OCCUR 3 TIMES WITHIN A TWO HOUR WINDOW.
29
THIS INDICATES THE OUTDOOR AIR HUMIDITY SENSOR IS OUT OF RANGE. WHEN THIS OCCURS, THE UNIT
CONTROLLER SWITCHES THE ECONOMIZER TYPE TO DRY BULB.
30
THIS INDICATES THE RETURN AIR HUMIDITY SENSOR IS OUT OF RANGE. WHEN THIS OCCURS, THE UNIT
CONTROLLER SWITCHES THE ECONOMIZER TYPE TO SINGLE ENTHALPY.
31
THIS INDICATES THE IAQ (CO2) SENSOR IS OUT OF RANGE. THE UNIT CONTROLLER CHANGES THE
VENTILATION MODE TO FIXED MINIMUM.
32 THIS INDICATES THE REAL TIME CLOCK CANNOT BE READ AS A RESULT OF A HARDWARE FAILURE.
33 THIS INDICATES THE SPACE TEMPERATURE OFFSET IS GREATER THAN 20 K OHMS.
34 THIS INDICATES THE CV/VAV INPUT IS OUT OF RANGE. THE UNIT WILL LOCK OUT.
35
THIS INDICATES THE 24-VOLT SUPPLY CIRCUIT HAS DROPPED BELOW THE ALLOWABLE LEVEL. THE CONTROL
WILL SHUT DOWN UNTIL THE VOLTAGE RISES ABOVE 19.2 VAC.
36
THIS INDICATES THE UNIT COOLING AND HEATING OPERATION IS SHUT DOWN BECAUSE THE UNIT IS
OPERATING IN A SMOKE PURGE MODE.
37
THIS INDICATES THE DUCT STATIC PRESSURE HAS EXCEEDED THE PROGRAMMED DUCT STATIC SHUTDOWN
SETPOINT.
38
THIS INDICATES THE SUPPLY AIR TEMPERATURE HAS EXCEEDED THE PROGRAMMED SUPPLY AIR TEMP
ALARM SETPOINT FOR COOLING.
39
THIS INDICATES THE SUPPLY AIR TEMPERATURE HAS EXCEEDED THE PROGRAMMED SUPPLY AIR TEMP
ALARM SETPOINT FOR HEATING.
40 THIS INDICATES AN ECONOMIZER MINIMUM POSITION ALARM.
41
THIS INDICATES THE SPACE TEMPERATURE IS ABOVE THE SPACE TEMP TRENDING ALARM TEMP AND MOVING
AWAY FROM THE SPACE TEMPERATURE SETPOINT.
42
THIS INDICATES THE DUCT STATIC HAS NOT RISEN QUICKLY ENOUGH IN A VAV UNIT WHEN THE SUPPLY FAN IS
ENERGIZED.
43
THIS INDICATES THE HYDRONIC HEAT FREEZE STAT HAS OPENED AND THE OUTDOOR TEMPERATURE IS
BELOW 45.0° F.
TABLE 8-9 – ALARM CODE DESCRIPTIONS (CONTINUED)