Vaillant ecoTEC plus 937 Instructions And Maintenance Instructions

Also see for ecoTEC plus 937: Operating manual Instructions for installation and servicing Operating manual

Contents

47Installation and maintenance instructions ecoTEC plus 0020031552_038.1.2 Diagnostic codesIn the diagnostic mode, you can change certain parame-ters or display more information.The diagnostic information is divided into two diagnosticlevels. Access to the second diagnostic level can only bepermitted after entering a password.a Caution!Danger of incorrect operation and wrong unitparametrisation!Access to the second diagnostic level must beused exclusively by a heating engineer.First diagnostic level• Press the "i“ and "+“ buttons simultaneously.The display shows "d.00“.• Use the buttons "+“ or "–“ to move to the desired di-agnostic number of the first diagnostic level (see theTable 8.2).• Press the "i" button.The associated diagnostic information is shown in thedisplay.• If necessary you can change the value with the but-tons "+“ or "–“ (display flashing).• Save the new value by holding down the "i“ button forapprox. 5 seconds until the display no longer flashes.You can end the diagnostic mode as follows:• Press the "i“ and "+“ buttons simultaneously. or• Do not press any button for about 4 minutes.The current heating flow temperature appears in thedisplay again.Troubleshooting 8Display Meaning Displayed value/settable valued.0 Heating partial load Adjustable heating partial load in kW (factory setting: max. output)d.1 Water pump over run time for heating mode 2 - 60 minutes (factory setting: 5 minutes)d.2 Max. anti cycle time heating at 20°C flow temperature 2 - 60 minutes (factory setting: 20 minutes)d.3 Measured value of the domestic hot water temperature in °Cd.4 Measured value for the warmstart sensor in °Cd.5 Flow temperature target value or return temperature tar-get value, if return flow regulation selectedin °C, max. of the value set in d.71limited by an eBUS controller, if fitted)d.6 Hot water target temperature in °C, 35 to 65 °Cd.7 Warm start target temperature in °C, 40 to 65 °Cd.8 Heat demand of external controllers (terminal 3-4) 1=closed (heating requirement); 0=opened (no heating requirement)d.9 Flow target temperature from external analogue regulatorto terminal 7-8-9/eBusin °C, minimum from ext. eBus target value and target valueterminal 7d.10 Status internal heating pump 1, 2 = on, 0 = offd.11 Status external heating pump (via accessory module) 1 to 100 = on, 0 = offd.12 Cylinder charging pump (via accessories module) 1 to 100 = on, 0 = offd.13 External hot water circulation pump (via accessory module) 1 to 100 = on, 0 = offd.22 Hot water demand 1 = on, 0 = offd.23 Summer /winter function 1 = Winter, 0 = Summerd.25 Hot water activation via eBUS controller 1 = yes, 0 = nod.30 Control signal for both gas valves 1 = on, 0 = offd.33 Fan speed target value in upm/10d.34 Fan speed actual value in upm/10d.35 Internal diverter valve position 0 = heating; 100 = hot water; 40 = mid-positiond.36 Hot water flow sensor in l/mind.40 Flow temperature actual value in °Cd.41 Return flow temperature actual value in °Cd.44 digitalised ionisation voltage Display range 0 to 102, >80 no flame, <40 good flame displayd.47 External temperature (only on weather-compensatedVaillant controllers)actual value in °Cd.67 Remaining burner anti-cycling time in minutesd.76 Unit variants (device specific number) 00 to 99d.90 Status of the digital controller 1 = identified, 0 = unidentified (eBUS Address <=10)d.91 DCF status with connected external probe with DCF77 re-ceiver (not available in the UK)0 = no reception, 1 = reception, 2 = synchronised, 3 = validd.92 Module recognition shift load storage tank Setting range:0 = not recognised1 = no communication via PE-BUS; Module recognised earlier2 = Communication OKSetting = 0: Unregister shift load storage tank from combi boiler(if shift load storage tank is to be de-installed, set d.92 = 0)d.97 Activation of the second diagnostic level Password: 17Table 8.2 Diagnostic codes of the first diagnosis level