BoilerFaultCodesWhat the manual says
Manufacturer manualProductinwaitingperiod/operationblockfunctionduetolowwaterpressure(flow/returnspreadtoolarge)
From this model's manual
Verified against the Vaillant/Vaillant Ecotec Plus 610 installation & service manual, page 32.
DIY fix possible
Check the pressure gauge on the front of the boiler; if it is below 1.0 bar, use the filling loop to increase it to between 1.0 and 1.5 barBleed all radiators in the house starting from the ground floor and working upwards to remove trapped airCheck that all radiator valves and system isolation valves are fully open
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Related fault codes
All 72 fault codes on the ecoTEC plus 430
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