20 BAS-SVX44C-EN
Power, System Tests, and Software Reset
This section provides information about:
• Applying power
• Power-up test
• System tests
Applying Power
Restore power to the HVAC equipment. The thermostat initiates a power-up test and will display an error,
if one is detected (refer to the sections, “Power-up Test,” p. 20 and “Error Codes,” p. 50). If no errors are
detected, the home screen appears as shown in
Figure 16.
Figure 16. Home screens
Power-up Test
The power-up test is performed any time power is applied to the thermostat. At the start of the power-up
test, the thermostat screen will display the following sequence of events, in order:
• All icons for approximately 1.5 seconds and then;
• The firmware version for 1.5 seconds (in the clock digit location), and finally;
• Self-testing.
If an error is detected, the error code will display whereby, the user can bypass the error by pressing the
Cancel icon (
). Once the self-testing has completed checking for any errors, the thermostat will display
the Home screen.
During the test, the configuration/test icon ( ) blinks on the LCD screen indicating a test is in progress.
Tab l e 5 lists the sequence of tests that occurs:
Note: For a detailed list and descriptions of error codes, refer to the section, “Error Codes,” p. 50.
Example of Home Screen: Heat OnlyExample of Home Screen: Auto Heat/Cool
Table 5. Error code test sequence
Test
Sequence Error Code and Description
1 E4;
• Operating range is 18 to 32 Vrms.
• Low error detection is less than 16.6, ±8.5%.
• High error detection is greater than 34, ±8.5%
2 E7;
• Memory error (write and read 0x55 and 0xAA failed).
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