Viessmann boiler error code 81
The viessmann boiler error code 81 is a problem with pressure regulation. This error code means that the boiler has been unable to maintain a set pressure. In most cases, your boiler pressure limit has been set too high for the current boiler load. All boilers have an inherent safety feature that will shut off the heating system if a certain pressure limit is exceeded. This prevents damage to the appliance and can also help prevent damage to property and water leakage.
A common cause of this error code is when you try to heat your home with too many radiators at once or in rooms where windows are open. Keeping windows closed and shutting off unused radiators can help prevent this error code from appearing again.
Two parts to the system might cause the error code 81; the thermostat and the condenser coil. If the thermostat is not working, there will be a lack of power to the burner, or the burner won’t come on at all. If it’s an issue with the condenser coil, there won’t be any pressure in the chamber, leading to very low water flow and no heat.
The thermostat can be found on the left side of the boiler and has numbers from 0-100. Check it, and if it’s not set to any number, then this could be your problem.
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