Turbomax crazy buzzing!

[gassafe]

My bros trusty old vaillant turbomax (black fascia green dial type) has started to play up! It's developed a crazy buzzing fault & wont ignite, fan is running okay...

when it's doing the crazy loud vibrating buzz it's coming from the gas valve, the spares parts code lists this item & calls it a gas operator, would this fix it or should I purchase the complete valve?

 

[Billy Bob Bob]

solenoids are failing,that will be the buzzing noise,its the large black bit bolted to the gas valve

 

[gassafe]

Its intermittent at the moment...

I pulled the connector off the solenoid expecting the fan to run & lockout hoping the silence would prove it was this faulty, but the burner lit up!? Is it normal for the burner to light with the solenoid disconnected!?

 

[lame plumber]

do as my daughter advices in this situation, employ an expert

 

[Leezygeezer]

Solenoid is easy to test, ring technical, ask for solenoid resistance values and test with multimeter, if outside of range there's a break somewhere in the solenoid. This is dead testing of course, no power!

 

[Leezygeezer]

Also, as it heats up, the copper windings can move slightly which can result in intermittent firing up

 

[gassafe]

Solenoid is easy to test, ring technical, ask for solenoid resistance values and test with multimeter, if outside of range there's a break somewhere in the solenoid. This is dead testing of course, no power!

Pfft, I'd rather pull teeth than wait on vaillants technical line... It would be quicker to send a carrier pigeon

 

[Leezygeezer]

You could just test it cold, if it reads open circuit it needs replacing anyway. The voltage operator (solenoid) looks fairly simple to replace, usually connect with power lead and screw/bolt washer type assembly

 

[Ollieg]

Just be aware that if it is the valve pictured, it's 200v DC. No second chance if you poke the hot bit.