Ideal Boilers Logic System 15 Installation And Servicing

Contents

51FAULT FINDINGFAULT FINDING FAULT FINDING FAULT FINDING FAULT FINDING FAULT FINDINGIdeal Logic System - Installation and Servicing70 aLTERNaTINg ‘F’ aND ‘4’ - CONTROL / NO FLOW ThERMIsTOR FaULT71 aLTERNaTINg ‘F’ aND ‘5’ - RETURN ThERMIsTOR FaULTRemove the Control/No Flow Thermistor from theHeat Exchanger and disconnect the wires.Check the resistance using a suitable multimeterconnected across the thermistors terminal pins.At 25 o C expect 9,700 - 10,300 OhmsAt 60 o C expect 2,400 - 2,600 OhmsAt 85 o C expect 1,000 - 1,100 OhmsIs the Thermistor value correct?Remove the Return Thermistor from the CH ReturnPipe and disconnect the wires.Check the resistance using a suitable multimeterconnected across the thermistors terminal pins.At 25 o C expect 9,700 - 10,300 OhmsAt 60 o C expect 2,400 - 2,600 OhmsAt 85 o C expect 1,000 - 1,100 OhmsIs the Thermistor value correct?YESYESNONOReplace PCBReplace PCBFit a new ThermistorFit a new ThermistorIs there continuity between the PCB and Thermistor?Is there continuity between the PCB and Thermistor?NONOYESYESCheck and replace wiring asnecessaryCheck and replace wiring asnecessary72 aLTERNaTINg ‘F’ aND ‘6’ - OUTsIDE sENsOR FaULTDisconnect the wires to the outside sensor.Check the resistance using a suitable multimeterconnected across the Outside Sensors terminal pins.At 0 o C expect 31,000 - 35,000 OhmsAt 15 o C expect 15,000 - 16,500 OhmsAt 30 o C expect 7,700 - 8,500 OhmsIs the Outside Sensor value correct?Replace PCBFit a new Outside SensorIs the wiring securely connected between theincoming terminal block boiler connection ofthe Outside Sensor and the PCB?NOYESSecurely connect the wiring atthe Terminal Block and the PCBIs the wiring securely connected at both the boiler andOutside Sensor?YESYES NONO Securely connect the wiring at both theboiler and Outside Sensor73 aLTERNaTINg ‘c’ aND ‘2’ - BCC FaULT (BOILER ChIp CaRD)Is the correct BCC for the boiler securely inserted into theslot at the front left of the PCB?(identified by the label on the BCC)YESNO Securely insert the correct BCC for the boilerinto the PCB and after switching power on and‘c0’ being shown, reset boiler.Note. Ensure the correct orientation of BCC byplacing “TOP” side up.Replace the BCC with a new BCC (that is correct for theboiler). After switching power on and ‘c0’ being shown,press reset. Is ‘c2’ still shown? Replace PCBYESREsET pROCEDURE - To reset boiler, turn mode knob to reset position and immediately turn knob back to required setting.