Question about Heating & Cooling
Posted by Anonymous on
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Posted on Jan 02, 2017
SOURCE: f20 error on vaillant eco28
F20 is a flow sensor error. Can be due to a defective sensor/ not correctly fitted, or you may have poor circulation, a big difference in flow and return temperatures, can sometimes make the boiler think it has a defective sensor, check good circulation through system, or if you have thermostatic radaiators valves on every single radiator, take 1 head off, as if you dont have a bypass fitted, it needs a radiator as a bypass circuit
Posted on Mar 03, 2009
SOURCE: Vaillant combi boiler problem
when the tap is turned on and the water light on the boiler doesn't this means the diverter valve is not operating it could be down to low water pressure in the house this can be checked at the cold tap in the kitchen. if there is plenty of pressure then it could be the diagphram in the diverter valve is worn or split. the diagphram is only a few pounds but it depends on the engineer you get as to how much money he wants to fit it.
the egg timer symbol (or two pyramids together) is an ignition indicator turn off and on again to see if it will fire with the tap running. reset the boiler with the lower right hand control knob.
Posted on Mar 26, 2009
The by pass pipe may be limed up. This apparently causes a reduced flow which will stop the heating side of the thing working. Call out Worcester Bosch engineer. It costs £210 including VAT and most parts and they almost guarantee to get it working.
Posted on Dec 02, 2009
jumper links not inserted in to pcb is h5 code
Posted on Mar 21, 2010
Testimonial: "Hi mylandlord eventually sussed it out and blanked of port1 and 3 on the pcb thanks for your help T"
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