Ideal Boilers Maximiser SE 42 Installation & Servicing Instructions Manual

Ideal Boilers Maximiser SE 42 Installation & Servicing Instructions Manual Manual pdf 34 page image

41 FAULT FINDING - CAUSES (CONT)Too high resistance in the central heating circuit, e.g. because of blocked thermostatic radiator valves or because ofblockage by dirt.The test switch on the control panel is switched on; put it back in off position.Too few radiators are open or the differential pressure switch is not properly adjusted.Defective safety sensor.Defective/polluted supply sensor.The pump is dead; loose contact in the connecting wires or the plug is incorrectly mounted in the control panel.Pump stuck or defective.Water level is too low in the central heating system because of a leakage or because of air in the installation. Checkthe pressure gauge, eventually fill up to 2 bar and open the air separator one full turn (provided that it was closed).The 11 kW jumper has been removed from the control panel or the partial load potentiometer is set at an insufficientvalue. If the fan only operates at low speed, the fan or control panel is defect.Too much resistance or dirt in the air circuit; check the air supply/combustion gas discharge system, the burner, andthe heat exchanger.The fan is not functioning properly; check the connectors and the fuse of the transformer and check the voltage onthe control panel connector.Return sensor is defective or not properly connected.Burner thermostat is open or not connected; check the thermostat for the switching point 107˚C. Check the burnercover for defects, it is possible that the flame will extend to the rear-side of the burner cover. Check the sealingbetween the mixing chamber and the heat exchanger and check the connection of the burner housing to the heatexchanger.The fuse F2 in the control panel is blown, caused by a short-circuit in the gas valve-circuit. Check the electricalconnection of the gas valve for a proper functioning.Disconnect the connector of the sensor and press “reset”. When the same fault remains, short-circuiting in the cableloom has occurred or the control panel is defect, otherwise the sensor is defect.Sensor defect or improper contacts and connections.The connecting wires of the igniter do not make contact or the igniter is defective or the fuse F1 is defective.Control panel should supply 120 V to connector.Improper gas/air ratio. Check the air restriction and the gas injector for the correct diameter, mounting, and pollution.The first and/or second gas valve does not open, check for a 24 V supply during the ignition phase. Check theresistance of the burner thermostat (unit electrically disconnected) maximum resistance of 3Ω.The burner is supplied with too little gas or air is present in the gas pipe; check the pre-pressure. If the control pipe isnot blocked, the gas/air ∆P should be checked at minimum and maximum load.Check the connection of the ionisation pin, use the pin to measure the ionisation current in series (this current shouldamount to at least 2 μAC).Check the mains supply during operation.Short-circuiting in the 24 V circuit (three-way valve or connector); check for a short-circuit and replace the F3 fuse inthe control panel.Press “reset” until “r” appears on the display.Gas inlet-pressure too low; check the inlet-pressure during operation at maximum load. Inlet-pressure should amountto at least 20 mbar (25 mbar -17%).Gas valves do not close; check the voltage on the gas valve. If a voltage is measured on both the gas valves (> 20 V),the control panel should be replaced. When ionisation occurs while the unit is not operational, the ionisation circuitshould be checked. If the control panel and the ionisation function properly, the gas valve has to be replaced.CauseNo.Cause description10111213141516171819202122232425262728293031323334Malfunction causes and remediesThe table shown below gives the possible cause of the malfunction described in frame 40.The table also provides instructions of how to remedy the malfunction.FAULT FINDING33 Maximiser SE - Installation