Bosch 12/18 Instruction Manual

PROBLEM CAUSE REMEDYLOCKOUT:Pulsation on start Combustion settings incorrect Set up as in installation instructionsFaulty nozzle Replace nozzleIntermittent lockout Bad electrical connection Check control box/electrical connectionsIntermittent flame detection fault See flame detection faultBurner motor fails tooperateFaulty motor or electrical supplyto motorCheck for 230v at motor plug duringstartup periodControl box fault Replace control boxFlame detection Photocell filmed over (dirty) Wipe cleanfault Photocell faulty ReplaceControl box faulty ReplaceIncorrect CO 2 Air adjustment fault Set up as in installation instructionsOil pressure incorrect Set up as in installation instructionsNo oil from nozzle No oil at pump Check and refill oil tank/bleed oil lineCheck and clean filters & valves from oiltank to boilerAir in pump Bleed pumpNozzle blocked Replace nozzleFaulty pump or drive ReplaceFaulty mechanical shut off valve Clean or replace(12/18 & 18/25 only)Ignition failure Electrode settings incorrect Set up as in installation instructionsFaulty ignition transformer ReplaceOpen circuit ignition Check and replace electrodes or hightension leads if necessaryFaulty control box or electricalconnections not properly madeCorrect control box electricalconnections or replace control boxBURNER FAILS No power to boiler Check electrical / control circuitTO START Faulty boiler thermostat Check by temporarily linking out highlimit and control thermostatsProgrammer open circuit Check by temporarily linking 8 & 9 onthe connectorFaulty control box ReplaceHIGH SMOKE Air intake/flue blocked Check & clear air intake/flueNUMBER Incorrect combustion settings Set up as in installation instructionsOil pressure incorrect Adjust to correct pressureIncorrect components used oncombustion headCheck with installation instructionsFaulty nozzle Replace nozzleFAULT FINDINGINSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/328 716 106 252b (07/0644FAULT FINDING& DIAGRAMSFAULT FINDINGBOILER LOCKOUT :Indicated by the illumination of the 'Lockout'indicator on the fascia.To reset, wait 2 minutes then press the lockoutreset button.Also refer to fault finding logic on pages46 and 47.UNDER NO CIRCUMSTANCES MUST ANAPPLIANCE BE LEFT TO OPERATE WITHANY CONTOL LINKED OUT OROVERRIDDEN.