Ideal Boilers LOGIC Code Combi 26 Installation And Servicing

57FaULT FINDINgFaULT FINDINg FaULT FINDINg FaULT FINDINg FaULT FINDINg FaULT FINDINgIdeal Logic Code Combi - Installation and Servicing87 aLTERNaTINg ‘F’ aND ‘5’ - RETURN ThERMIsTOR FaULTRemove the Return Thermistor from the CH ReturnPipe and disconnect the wires.Check the resistance using a suitable multimeterconnected across the thermistor’s terminal pins.At 25 oC expect 9,700 - 10,300 OhmsAt 60 oC expect 2,400 - 2,600 OhmsAt 85 o C expect 1,000 - 1,100 OhmsIs the Thermistor value correct?YESIs there continuity between the PCB and the Thermistor?Fit a new ThermistorNO88 aLTERNaTINg ‘F’ aND ‘6’ - OUTsIDE sENsOR FaULTDisconnect the wires to the outside sensor.Check the resistance using a suitable multimeterconnected across the Outside Sensor’s terminal pins.At 0 o C expect 31,000 - 35,000 OhmsAt 15 oC expect 15,000 - 16,500 OhmsAt 30 oC expect 7,700 - 8,500 OhmsIs the Outside Sensor value correct?YESIs the wiring securely connected between theincoming terminal block boiler connection of theOutside Sensor and the PCB? Replace PCBFit a new Outside Sensor and reset afterpowering up.NOSecurely connect the wiring at the TerminalBlock and the PCB and now resetIs the wiring securely connected at both the boiler andOutside Sensor?Note. Boiler must be reset to recognise the sensor after the removal.YESNOSecurely connect the wiring at both theboiler and Outside Sensor89 aLTERNaTINg ‘F’ aND ‘0’ - NO WaTER FLOW ThERMIsTOR FaULTDisconnect the wiring from the No Water Flow ThermistorCheck the resistance using a suitable multimeter connectedacross the Thermistor’s terminal pins.At 25 oC expect 9,700 - 10,300 OhmsAt 60 oC expect 2,400 - 2,600 OhmsAt 85 o C expect 1,000 - 1,100 OhmsIs the Thermistor value correct?YESIs the wiring securely connected to the low voltage 11 wayconnector at the rear right of the PCB?YES Replace PCBFit a new ThermistorNOSecurely connect the wiring to the PCBIs the wiring securely connected to the No Water FlowThermistor (located in the top of the Heat Exchanger?)YESNO Securely connect the wiring to the NoWater Flow ThermistorNONOYESReplace PCBCheck and replace wiring as necessaryNOYES