NO BEEP No beep after master switch ON

What the control is telling you

Master switch is turned ON but no confirmation beep is heard within about 8 seconds, so the system never gets ready.

Applies to: 300DVBLN/PSC7, 400DVBLN/PSC7, 500DVBLN/PSC7 (Signature Command)

Likely causes

• Batteries in backwards or too weak
• AC adapter not plugged into the mains (LED not solid green)
• 5-pin connector on the AC module bent or broken
• Command center cable to the control board not connected
• Failed AC module, control board or command center

Test and repair steps

1. Check battery polarity and voltage; reinstall or replace
2. Make sure the AC plug is in the mains and the LED is solid green
3. Inspect the 5-pin connector on the AC board and repair or replace the board
4. Confirm the 2 ft or 15 ft cable between command center and control board is seated
5. Replace the control board or command center if still dead

Other codes on the same units

• 1 RED / 2 sec (until reset) Pressure switch failure (power vent only)
• 1 RED-GREEN / 2 sec Pilot lockout - flame loss
• 2 BEEPS Double beep (confirmation)
• 2 RED Spark fail
• 2 RED / 10 sec No or low thermopile power
• 3 RED No sensor signal
• GREEN FLASH 1/sec Learning mode
• GREEN SOLID AC power on