Manuale Tecnoalarm T4 Mec Hotfile.61 1

| Symptom | Likely Cause | Fix (from manual) | |---------|--------------|--------------------| | Keypad shows “COMM FAIL” | Bus wires reversed or shorted | Check DATA and CLK polarity; resistance between DATA/GND should be > 10 kΩ | | Dialer doesn’t call | Incorrect dial prefix or no PSTN line | Set 04 – TEL – DIAL MODE to TONE; connect a phone to test line | | Siren doesn’t stop | Output programmed as “LATCHING” | Reprogram output to “BELL CUTOFF” with timer 20 min | | False alarms on zone 2 | Loose resistor joint | Replace EOL resistor (4.7k or 10k) and verify zone resistance: ~6.6k (tamper closed) | | Cannot enter installer code | Old code changed or EEPROM corruption | Perform factory reset: power off, remove battery, short JP2 for 30 seconds |

Any NC or EOL (4.7k/10k) wired detector – PIR, magnetic contacts, glass break, shock sensors. Manuale Tecnoalarm T4 Mec Hotfile.61 1