ACC-SVN28A-EN 14
Installation
Note: To reset the program and initiate a Self Diagnostic Test; press the PROGRAM KEY, HOLD TEMP KEY, and DAY KEY simultaneously.
Table 9. Troubleshooting
Problem Solution
Display does not come on. Check the 24 VAC power supply at terminals 11 and 14 at the Zone
Sensor. Verify that the terminal block is properly positioned on its pins.
No communications to the UCP. Check for 22 to 32 VDC between terminals 11 and 12 at the Zone Sensor.
Check wiring if no voltage is present.
Displayed Zone Temperature reads Sh and the COOL FAIL
icon is continuously illuminated.
1. Verify that Option 10 in the Options Menu is set correctly. If correct,
check the wiring from the remote sensor at terminals S1 and S2 for a
shcrted condition.
2. If Option 10 in the Options Menu is set to 0, then the local thermistor
is selected and the on-board thermistor is shorted and the ZSM must be
replaced.
Displayed Zone Temperature reads oP and the COOL FAIL
icon is continuously illuminated.
1. Verify that Option 10 in the Options Menu is set correctly. If correct,
check the wiring from the remote sensor at terminals S1 and S2 for a
open circuit condition.
2. If Option 10 in the Options Menu is set to 0, then the local thermistor
is selected and the on-board thermistor is open and the ZSM must be
replaced.
Zone Temperature is not displayed. Verify that number 1 has been selected for option 12 in the Options Menu.
ZSM keypad does not respond to selection Verify that the Keypad is not in the Lockout Mode. Press and hold the
TIME ("+") and ("-") Key for 4 seconds to unlock the keypad.
The Clock requires reprogramming after short power
interruptions.
Replace Battery.
CHECK FILTER icon flashes. Set option 11 to appropriate accumulated run time. If this function is not
desired, set to DISABLED.
Buzzer indicates System Failure or Service is required. Press the ERASE Key to reset the filter lapse timer. Buzzer will be reset
until noon of the next day if a System Failure has not been corrected.
"99" is displayed. Space temperature is above or below the measurable range.
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