11
Troubleshooting Guide
Problem Cause Remedy
1) All yellow lights 
flashing together.
1a) IR sensor cell has 
become unseated.
1a) Remove sensor access 
door and push both ends of 
sensor down. (Do not 
remove/reinsert sensor cell.) 
Restart unit and examine.
1b) IR sensor cell has 
failed. 
1b) Replace with new IR cell. 
2) Will not detect CO
2
. 2a) Unit may not be 
warmed up and 
ready to use.
2a) Verify unit is beeping and 
no yellow lights are flashing. 
(Single green light flashing 
while unit is beeping is OK.)
If yellow lights are scrolling 
across, wait 90 seconds and 
see if the unit starts to beep. If 
not, contact INFICON.
2b) Pump may have 
failed.
2b) You should hear the pump 
running after the D-TEK CO2 
has completed its warm up 
sequence and is held up to 
your ear. VERIFY it is not a 
low battery condition (see 
#3). If not, contact INFICON.
2c) Filter cartridge 
may be clogged, 
preventing air and 
refrigerant from 
passing into IR cell.
2c) Replace used filter 
cartridge with a new one.
2d) Battery may be 
dead.
2d) See #3 below.