Boiler not working

Not my area of expertise (Computers is), HOWEVER am a General Contractor, and I listen to my sub's. (Subcontractors; i.e, HVAC, Carpenters, Plumbers, Electricians, Roofers, etc)

DON'T turn it off, or remove from power. You'll delete the fault code.

Write down the fault code F.28.

Call an experienced HVAC company to fix.
(Heating, and Air Conditioning)

If you turn the power off to it, or mess with it, you could loose the fault code for the repairman.

This means he/she stands around until it comes back, (They get paid by the hour), or comes back the next day, or when possible.

HVAC people get swamped this time of year. It may not be a next day return. Could turn into MANY days later.
Do not remove fault code.

Regards,
joecoolvette

Check sensor whether fix in proper place.

the faster the flow the low the temp , the slower the flow the hotter the temp

Got exactly the same problem with mine. Manual says f28 = fault in gas supply, gas pressure too low. Boiler will ignite but goes out within minutes? HELP!

F-28 is a common error for my vaillant. I have had this problem serviced at least 10 times (all under warranty). It is an ignition problem and can be connected to a number of things. I have had the starter electrodes cleaned only to later have them replaced(4 times). I just had the "panel" replaced yesterday (looks like a motherboard or electronics panel). This is the second time to have this replaced. All of these things can give you an F-28 error message. I have an atmotech pro and have had ongoing F-28 issues for two years. They are looking at venting/air issues as well to see if this is the problem. douglas

your fan may need attension fan runs after boiler shuts down is normal on some Vokera,s too clear fumes out the flue 2mins approx

IF the weather is extremely cold, and you're getting F28, the external pipework may be blocked with ice. Warm up the external pipes (lag them if you can) - and now see if your boiler will re-ignite.

A friend fixed our condenser boiler with this tip - hope it helps you.

sounds like you have an earth leak or defective pump winding