NAPCO ERROR CODES
 Note: If you cannot clear a system trouble yourself, call installing company for service as soon as possible.

E01-00 AC Power Failure This trouble will occur if AC power is not present. Make sure system transformer is plugged into
AC receptacle and check the circuit breaker, otherwise call installing company for service.

E02-00 Low Battery If there has been a recent power failure, the battery may be partially depleted and must be
recharged by the control panel. The control panel performs an automatic daily test of the
battery, at which time the trouble will clear if the battery has been recharged. 

E03-00 Communication Failure
The system was not able to report to central station. If this is due to a temporary interruption in
the telephone service, the trouble can be cleared when the service is restored by performing a
Communication Test:
1 While disarmed, enter your User Code followed by A.
2 Answer NO (F) until "ACTIVATE DIALER TEST" appears in the window.
3 Press YES (E) to send a test signal to the central station.
If the trouble continues, call installing company for service.

E04-NN Wireless Transmitter Supervisory Failure
A problem has been detected with a wireless transmitter. Call installing company for service.

E05-NN Wireless Transmitter Low Battery
The battery in a wireless transmitter is low and should be replaced. This transmitter is on the
zone corresponding to the number NN. The replacement battery for the GEM-TRANS2 door/
window transmitter, GEM-PIR motion detector and GEM-GB glass break detector is the Duracell
DL123A 3 volt lithium. (2 required for the GEM-PIR and GEM-GB). The replacement battery for
the GEM-SMK is the Duracell MN1604 9 Volt Alkaline (2 required). The GEM-DT Dual
Technology Sensor requires 4 C cell alkaline batteries.
Warning: Replace batteries only with the same type as specified above. Use of another battery
may present a risk of fire or explosion. Do not recharge or disassemble battery, or dispose of in
fire.

E06-NN Receiver Response Failure
Call installing company for service.

E07-00 Download Failure Call installing company for service.

E08-00 Telephone Line Cut The telephone line has failed. If telephone service has been temporarily interrupted, the trouble
will clear automatically when it is restored. Otherwise, call installing company for service.

E09-00 System Cold Start

E10-NN Keypad Response Failure Call installing company for service.

E11-NN Keypad Tamper A keypad has been removed from the wall. Call installing company for service if
problem cannot be repaired.

E12-NN Expansion Zone Module Response Failure
Call installing company for service.

E13-NN Expansion Module Tamper The cover has been removed from a zone expansion module. A problem has been
detected with an Expansion Module. Call installing company for service.

E14-NN Relay Board Response Failure
NN= Relay Board Number. Call installing company for service.

E15-NN RF Transmitter Tamper Wireless Transmitter Tamper Cover removed. NN=Transmitter Number. Call installing
company for service.

E16-NN Wireless Receiver Jam A problem has been detected with the wireless receiver. Call installing company for
service.

E17-NN Receiver Tamper Condition Call installing company for service.

E18-NN KeyFob Transmitter Low Battery
The batteries (2) in the wireless KeyFob transmitter indicated are low and should be
replaced. The replacement battery is the #386 watch battery.
Warning: Replace batteries only with the same type as specified above. Use of another
battery may present a risk of fire or explosion. Do not recharge or disassemble battery, or
dispose of in fire.

E19-00 User Program Memory Error
Call installing company for service.

E20-00 Dealer Program Memory Error
Call installing company for service.

E21-00 System Shutdown Call installing company for service.

E22-NN Sensor Watch Activity Failure
A Motion Sensor on the zone indicated has failed the programmed Sensor Watch activity test.
Insure that the sensor is able to detect activity in the area; clear any obstacles which may be
blocking the sensor from detecting activity. Press C to clear the display, and then use the
Function Menu to Reset Sensor Watch Failure (see page 17). If you cannot correct the problem
yourself, call installing company for service.

E23-00 Burglary Bus Failure Call installing company for service.

E24-00 Service Message The system is in need of a preventive maintenance service call. Call installing company for
service. (With GEM-P9600/3200 panels only).

E27-00 Printer Failure Call installing company for service.

E39-00 Receiver Capacity Error
Call installing company for service

E40-00 RF Self Test Failure A wireless motion sensor on the zone indicated has failed its automatic self test routine.
Call installing company for service.

E41-NN Fire Trouble A problem has been detected on the Fire zone indicated. Call installing company for service.
(GEM-P1632, GEM-P816 and GEM-P1664 panels only).

E51-00 Bell/Siren Trouble There is a problem with the Bell or Siren. Call installing company for service.

E58-00 Telemetry Trouble Call installing company for service.

E59-00 Telemetry Failure Call installing company for service.

E66-00 Dirty Smoke Detector Clean Smoke Detector or call installing company for service.

E99-00 Keypad Panic Shorted to Long
Call installing company for service
You can contact us by e-mail as well. We will call
and schedule a time to meet you.
e-mail Tim@aepsecurity

Service 614-870-0236

Headquarters 234-294-9049