7Troubleshooting Guide
| Problem | Solution |
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| The thermometer is | Remove and reinstall the batteries or |
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| “locked up” (the | disconnect and reconnect the ac |
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| display is “frozen”). | adapter. |
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| The display is either | 1. Clean the thermometer lens. |
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| erratic or stays at | Refer to Section 4.2. |
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one reading.
2. Activate the Diagnostic routine of the thermometer as follows (while looking at room temp):
a. Pull the trigger and press the LOCK key to lock the trigger.
b. Press the FUNC key and LOCK key at the same time.
You can expect to see and hear the following:
• You will see the model and version number “VER X.X” of the software for about 1 second.
• You will hear a beep, “TST” is displayed.
• Soon after, all of the segments of the display including the backlighting will light up for about 1 second.
• The display will clear and a PAS (pass) or ERR (error) code may be seen on the display.
ERR1: Infrared temp reading is >150°F or < 23°F.
ERR2: Ambient temp >122°F or < 32°F
ERR3: Can not read from EEPROM memory
EER4: Can not write to EEPROM memory
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