Ideal Boilers i-mini 24 Installation And Servicing

Contents

50Fault FindingFault Finding Fault Finding Fault Finding Fault Finding Fault Findingi-mini - Installation and Servicing68 aLTERNaTINg ‘L’ aND ‘1’ - FLOW TEMpERaTURE OVERhEaT LOCKOUTIs the Boiler and CH System filled with water and allisolation and radiator valves open?YESFill and vent the system and open allisolation valves, then restart boilerIs the Flow/Return Differential across the Boiler inexcess of 30°C?NOCheck that the Pump is rotating freely. Isthe Differential now below 20°C?YESNOReplace the Pump,then restart boilerNOOK, nowrestart boilerYES69 aLTERNaTINg ‘L’ aND ‘2’ - IgNITION LOCKOUTIf the boiler is restart does theboiler ignite for a short time andthen extinguish?YESIs the Gas Pressure available atthe Boiler Inlet (>18 mbar)?Check the detection electrodeand associated harness for:continuity, visual condition andposition (Refer to Frame 46).Check if the condensate pipe isblocked.Check flue is installed correctly.Replace as necessaryNO Check gas supply andrectify faultNOYESIs 215Vdc supply available at theGas Valve? (* See note)YESCheck spark generator andassociated harness for: continuityand visual condition. (Refer toFrame 52) Are these functioningcorrectly?YESCheck ignition electrode andassociated harness for: continuity,visual condition and position.(Refer to Frame 45) Are thesefunctioning correctly?NOCheck siphon and condensatedrain pipe work for blockage andrectify if necessary. Boiler nowworking OK?Check wiring connectionfrom gas valve to PCB forcontinuity. If the wiring isOK then replace the PCBNOReplace SparkGenerator and harnessas necessaryNOReplace IgnitionElectrode andassociated harness asnecessaryNOReplace Gas ValveYES* note: due to the wave form of the rectified voltage, the reading will vary depending on the type of meter used to measure thevalue. In general terms a reading greater than 150V indicates that the correct voltage is supplied to the gas valve.Unplug gas valve. Is resistancebetween outside pins 4KΩ (±2)?YESReplace Gas ValveNOREsTaRT pROCEDURE - To restart boiler, turn mode knob to restart position and immediately turn knob back to required setting.REsTaRT pROCEDURE - To restart boiler, turn mode knob to restart position and immediately turn knob back to required setting.Check the Return Thermistor(Refer to Frame 44)Check resistance using a suitable multimeterconnected across the thermistor’s terminal pinsAt 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 Ohms