Troubleshooting
Maintenance The Environmental Monitoring Unit requires periodic maintenance.
•To remove any visible buildup of dust from the temperature and humidity probe, gently brush or vacuum the probe. Do not blow any type of compressed gas into the probe.
•For maintenance of contact sensors, see the sensor manufacturer’s product literature.
Correcting |
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Problem | Possible Cause |
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| Constant alarm on | No jumper wires |
| For each unused zone, |
| one or more | for unused zones. |
| connect a wire |
| unused zones. |
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| between the COM and |
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| NC terminals. |
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| Constant low | 12 VDC supply |
| Correct the short |
| temperature and | (pin 1) shorted to |
| circuit: examine all |
| humidity readings. | ground or |
| sensors that use the 12 |
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| overloaded. |
| VDC power supply. |
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| Incorrect sensor | Improper sensor |
| Correct the sensor |
| readings. | wiring. |
| wiring. (See “Contact |
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| Sensors” on page 7.) |
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| Continual reports | Probe not |
| Connect the probe |
| of low temperature | connected |
| properly. (See |
| or humidity. | properly. |
| “Connecting the |
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| probe(s)” on page 5.) |
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| Continued on next page | |
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