Troubleshooting, continued79Troubleshooting the SystemProblem A fault occurs the first time the system was started.Solution You will probably find the fault in the cabling between the different units (i.e., two-wire cableand field decoder, field decoder and solenoid, pump decoder and pump, etc.) Check that thehook up from unit to unit is done properly.Problem A fault occurs after the system is serviced.Solution You will probably find the fault around the serviced area. It is rare for two faults to occur at thesame time.Problem A strong smell, heat buildup or smoke develops in the controller during a fault.Solution Switch the controller off immediately and replace the unit. The fault is probably in thecontroller.Problem Nothing works when you turn on the controller; the system is dead.Solution The controller is either defective or there is no power reaching the controller.High Voltage!Check the Mains 120-Volt AC power line leading into the controller. Make sure the Mainspower is turned on.Check the Mains cabling. Make sure it isn’t severed, kinked or showing a short.Check for burned out fuses or tripped circuit breakers in the Mains cabling line (if applicable).There are no fuses inside the MDC Controller, except for a non field-replaceable thermal fuse,which automatically resets once a short circuit is cleared.If the system uses a power disconnect switch, make sure it is not engaged.Measure the supply voltage (in the AC range) in the wire nuts. The voltage should be around120 V. (The controller should work, with no problems, at a nominal voltage of 80% of theMains.) If the voltage you read is lower, the fault is in the controller and you should replacethe controller.
