Viessmann Vitodens 200 Boiler Short Cycling

Hello All,

My seven years old Viessmann Vitodens 200 boiler has started short cycling. It fires up for approximately 10-20 seconds & then suddenly cuts out. Radiators are hardly getting Luke warm and it does the same for hot water. What should I do? Your suggestions are highly appreciated.

Thanks in advance

Jim

Hi Jim,

When your boiler’s minimum boiling & firing surpasses the existing system load, it can cause boiler short cycling because it can force the boiler to fire up for shorter periods. In other words, boiler short cycling occurs when the boiler is over lockout as compared to its heating demand. In case, you have various heating zones & just one or few zones are calling for heat then, boiler fires & gets to temperature quickly. It happens over & over causing useless firings. In order to prevent the boiler short cycling you have to check the following things:

  • Check for the correct grounding of your boiler
  • Check for the right flow of water in the system
  • Check for the air in your boiler
  • Check for congested air inlet on concentric venting system