A: Check power supply voltage at intercom is 23.4v DC or more. Cable length from PSU to intercom should be less than 25 feet and in 14 gauge for longer distances. See guide. Check the fuse.

A: This means the unit is not able to detect the network for some reason.

• Power off the unit, remove the SIM and check it in a mobile phone to verify it can make a call and has calling credit if it is a Pay As You Go SIM.
• Disable any PIN code request if active on the SIM card.
• Check the SIM is a standard voice capable SIM. If you are unsure, contact your SIM card provider to verify.
• Check the reception is medium or good. Poor reception is not sufficient.
• Power off, remove the SIM, use fine sand paper to lightly sand the SIM pads and contacts on the GSM unit, lightly bend the contacts upwards so that they make better contact with the SIM and try again.
• Check antenna is connected and does not have too many sharp bends on the antenna cable.
• Check the height of the antenna and make sure it is not inside a metal enclosure.
• Check correct power cable size for cable length from PSU. Refer to manual for guidelines

A: Decrease the calling time as per programming instructions.

A: If your number is a private or number withheld, then it will not work.

• Ensure the number is programmed as you would normally dial it from another phone.
• Ensure you have adequate GSM signal at the intercom by sending *20# as a text.

A: This may be caused by a defective microphone, water on a microphone from a sprinkler for example, or dirt/insects blocking the microphone hole. Follow steps below also for further checks.

• Check reception level by *20#.
• Change SIM card if necessary, to another network which may have better coverage
• Purchase a high gain antenna.

A: A small amount of GSM buzz can be considered normal on GSM intercoms, but not so much that causes inability to hear the person speaking. This is a symptom of poor reception. Try above steps on checking and improving reception. Consider fitting an external high gain antenna. Move the antenna further away. Remove any short bends in the antenna. Ensure the spare antenna cable is not rolled up inside the call station.

A: Check if you can hear the relay clicking at the gate when the keys are pressed during a call. If it can be heard, then the system is working, check wiring between the relay and the lock or gate panel. If the relays do not make a clicking sound, then check this feature on a different mobile cell phone or landline. If it works on a different phone, check the settings on the phone in question under DTMF tones. Failure of DTMF tones to operate correctly is also a symptom of low reception or insufficient power cabling.

• Check that the relays are not already latched with the *22# command. If they are latched, they need unlatched before the trigger keys will work.
• Check if it works by SMS. Try latching a relay then use the status button to check if the relay is latched. If that works, problem could be the phone being used, or low signal strength at the intercom