Vaillant ecoTEC plus Instructions For Installation And Servicing

Also see for ecoTEC plus 415: Instructions for installation and servicing Instructions for use Instructions for installation and servicing

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Vaillant ecoTEC plus Instructions For Installation And Servicing Manual pdf 40 page image

Instructions for installation and servicing ecoTEC plus 0020020828_074010 Troubleshooting10.1 Logical fault finding procedureThese checks must be carried out before attempting touse the fault finding guide.1. Carry out electrical safety checks (see section 4 ‘Wiringsystem’).2. Check that the external electricity supply to the boileris on, and a supply of 230 V~ is present between boilerterminals ‘L’ and ‘N’.3. Check that the gas supply to the boiler is on, that ithas been correctly purged and that an inlet pressureof 20 mbar is available at the gas valve. (See section5 ‘Gas Supply’).4. Ensure the heating system is full of water and thesystem design pressure is attained. (sealed systemsonly). If not, refill and vent the system. Ensure any flowand return isolating valves (if fitted) are fully open.5. Set the central heating temperature to maximum.6. Set the domestic hot water temperature to maximum(Only if additional Vaillant accessories are fitted).7. Check that all external controls are on and calling forheat (if no external controls are fitted, boiler terminals3 and 4 must be linked). Check that the boiler anti cy-cling economiser is not engaged.10.1.1 Status codesThe status codes that you can see on the display providesinformation about the current operating condition of theappliance.The display of the status codes can be called as follows:• Press the “i” key.The display shows the status code, e.g. S.4 for “Burnermode - Heating". The display of the status codes canbe cancelled as follows:• Press the “i” key.• Do not press any key for approx. 4 minutes. The currentheating flow temperature appears in the display again.Fig. 10.1 Display of status codes10.1.2 Diagnostic codesIn the diagnostic mode, you can change certain parame-ters or display more information. The diagnostic infor-mation is divided into two diagnostic levels. The seconddiagnostic level can be reached only after entering apassword.Display MeaningHeating mode (all models)S. 0 No heat demandS. 1 Fan runningS. 2 Water pump runningS. 3 Ignition sequenceS. 4 Burner ignitedS. 5 Fan and pump runningS. 6 Fan over runS. 7 Pump over runS. 8 Anti cycling modeDomestic hot water mode (when accessories are fitted)S.20 Warmstart demandS.21 Fan runningS.22 Pump runningS.23 Ignition sequenceS.24 Burner ignitedS.25 Fan and water pump runningS.26 Fan over runS.27 Pump over runS.28 Anti cycling modeCharge hot water cylinder (when accessories are fitted)S.20 Warmstart demandS.21 Fan runningS.22 Pump runningS.23 Ignition sequenceS.24 Burner ignitedS.25 Fan and water pump runningS.26 Fan over runS.27 Pump over runS.28 Anti cycling modeAll boilers:S.30 No heating demand from external controls (clamp 3-4 open)S.31 Central heating thermostat knob turned off or noheat demand by the eBUS control unitS.32Heat exchanger antifreeze active, as fan speed varia-tion is too high. Appliance is within the waiting timeof the operation block functionS.34 Anti frost mode activeS.36 No heating demand from low voltage controls (clamp 7-8-9)S.41 Water pressure > 2,9 barS.42 Response from accessory module or defective conden-sate pump is blocking burner operationS.53 Appliance is within the waiting period of the operation blockfunction due to water shortage (VL-RL spread too big)S.54 Appliance is within the waiting period of the operation blockfunction due to water shortage (temperature gradient)S.96 Return-sensor check is running, demand (DHW orheating) is blockedS.98 Flow-/Return-sensor check is running, demand (DHWor heating) is blockedTable 10.1 Status codes10 Troubleshooting