Operating Instructions

ERROR STATUS Messages
Siemens Building Technologies, Inc. 5-25
ERROR STATUS Messages
Each application contains a point called "ERROR STATUS," which appears as point number 99
on the display. ERROR STATUS gives a numerical indication of any internal errors detected
during power-up of the controller. A status of zero indicates no problems. Other codes appear in
Table 5-6.
If ERROR STATUS is a value other than one shown in Table 5-6, then a multiple error condition
exists. The value of ERROR STATUS is the sum of any current error conditions. To evaluate
multiple errors, subtract the greatest value possible (obtained from Table 5-6) from the value
displayed in ERROR STATUS that will still yield a result equal to or greater than zero. If the result
is greater than zero, continue subtracting (using the values listed in Table 5-6) until the result is
zero. See the following example:
Example
The value for ERROR STATUS is 80.
1. Select the greatest value from the ERROR STATUS table (Table 5-6) that can be
subtracted from 80 to get a number equal to or greater than zero. In this example,
subtract 64 from 80. 80 − 64 = 16. Error condition 64 exists. A remainder of 16 indicates
that another error condition is present.
2. To find the remaining error conditions, continue subtracting error codes from the
remainder until the remainder is zero. In this example, 16 − 16 = 0. So, in addition to error
condition 64, error condition 16 is also present.
Table 5-6. ERROR STATUS Descriptions.
ERROR STATUS Description
0 Everything is operating properly.
128 The controller electronics interface for the room temperature sensor has failed. This may
occur as a result of a defective room temperature sensor or invalid setpoint readings.
Initializing the controller may clear this error condition. See Clearing an Error Condition
for the procedure.
64 An analog-to-digital (A-to-D) converter failure has occurred. This condition may occur as
a result of a defective room temperature sensor or invalid setpoint readings. The
controller may correct this condition automatically. If not, initializing the controller may
clear this error condition. See Clearing an Error Condition for the procedure.
16 The controller's Electronically Erasable Programmable Read Only Memory (EEPROM)
has failed a write test. Initializing the controller may clear this error condition. See
Clearing an Error Condition for the procedure.