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d Zener safety barrier failure. If the vapor sensor checks out to be functional, then <br />the malfunction may be a short circuit within the zener safety barrier. If the sys- <br />tem is equipped with more than one ZSB-2 safety barrier, then a quick check can <br />be made by exchanging the questionable barrier with a functional part. And con- <br />tact the installer, authorized repair center or your local service agent for replace - <br />Channel PC card failure. The malfunction may also be in the card. If the system is <br />equipped with more than one channel PC card, then a quick check can be made <br />by exchanging the questionable card with one from the working channels. If <br />replacement is required, contact the installer, or your local service agent. <br />3. VAPOR ALARM FAILS TO "VAPOR" PRESSED. <br />- •. • r - .. Z. - <br />a. Improper alarm set point adjustment. Adjust the VADJ trimpot clockwise to <br />increase the sensitivity (See section IV.2.2. VAPOR ALARM ADJUSTMENT page <br />27). <br />b. Channel PC card failure. If after adjustment of the VADJ trimpot, the channel still <br />associatedhas a malfunction, the failure might be with the channel - <br />channelC card. If <br />the - _ <br />-PC card with a working <br />of the <br />C card would be to exchange the questionable <br />card, and contact the installer, authorized repair center or your local service <br />agent if replacementneeded. <br />11 • ; <br />Possible causes and remedies: <br />a. Liquid present in the monitoring well. Check the sensor for possible contact with <br />any liquid in the monitoring space orwell. If liquid present, then remove the liquid <br />in the correct manner complying with all laws and regulations. <br />