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IV.3. TROUBLESHOOTING (continued) <br />b. Open circuit in the liquid sensor circuit. Check all connections for wiring con- <br />tinuity with an ohm meter check for very high resistance or open. If there are <br />more than one liquid sensing circuit in the system it might be possible to <br />exchange parts to localize the failure to one area Replaceable parts are the sen- <br />sor, sensor home run cable, zener safety barrier, and channel PC card. After the <br />malfunction has been located or if further help is needed to locate the problem <br />contact the installer, authorized repair center or your local service agent. <br />(NOTE: It the channel has no liquid sensor connected, then install a jumper wire <br />between the mother board terminal marked BLUE and the ground terminal. See <br />Section 111.5., Page 20 for information on sensor wiring.) <br />a. Sensor wire grounded. Check to see if the BLUE wire from the mother board tc <br />the safety barrier or terminal no 7 is mistakenly grounded. Remove incorrec* <br />. <br />ground and retest the system. See Section 111.5., Page 19, 20, 21 for information <br />on sensor wiring. <br />b. Channel PC card failure. If none of the above malfunctions were found then th( <br />problem might be in _ channel .. card. If there is another•: <br />in th, <br />• : the questionable car• with c working card. If needed, contac <br />the installer, authorized repair center or our local service agent for replacemer <br />or further help. <br />RN <br />