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Discuss Viessmann boiler short cycling in the Central Heating Forum area at PlumbersForums.net

Hi,

I have noticed my boiler Viessmann Vitodens 100-W(B1HC-26) makes a series of short cycling before starting to heat. Boiler is controlled by Baxi uSense room thermostat connected via Opentherm. I installed some monitoring equipment to get the better understanding of the problem. Bellow is the illustration of the problem:
Viessmann cycling.png

I will explain the graph from the top to bottom:
  • Green bar indicates heating pump is on
  • Red bar indicates flame is on
  • Black line indicates max relative modulation level (%)
  • Orange line indicates DWH temperature (Celsius) (not relevant in this problem )
  • Red line indicates boiler water temperature (Celsius)
  • Grey line indicates setpoint temperature (Celsius)
The graph reveals that it took 10 times for the boiler to fire up until it started to run. Water temperature inside the boiler reaches ~40 degrees very quickly after boiler fires up and then it switches off.

I would appreciate any ideas of how to solve the short cycling.
 

ShaunCorbs

Staff member
S. Mod
Plumber
Gas Engineer
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