Hope someone can help, I've noticed in the last month or so that my Vaillant Turbomax plus 828e is ignoring the settings of the timer - Switch110 - it seems to be following the timer during the day, but turns the CH on randomly during the night when the tappets on the timer switch are definitely set for CH to be off (from around 23:00 - 07:00).
I've checked the basics, like the time that the programmer is set to and it's correct. Have rotated the time through 24 hours to listen for the click as the tappets cause the switch to request the boiler to demand CH. This all appears fine, as the Switch 110 is just a mechanical / clockwork timer, it Appears to be working correctly.
Note that this is my second Switch 110, first one installed with the system stopped going round, just died stuck at one time and was replaced under warranty.
As the CH comes on independent of the timer in the middle of the night, and appears to work OK during the day, I'm wondering if it has something to do with the frost thermostat (but this is pure guess and probably wrong!).
The hot water demand is fine and the CH operates correctly when the timer requests that CH be turned on. There are no fault codes displayed on the status panel. If I check when the system turns itself on randomly, status d 8 = 1
Boiler is 2 and a half years old, I live in a hard water area, boiler has been regularly serviced since install.
Has anyone got any ideas, or seen this before?
Many thanks
I've checked the basics, like the time that the programmer is set to and it's correct. Have rotated the time through 24 hours to listen for the click as the tappets cause the switch to request the boiler to demand CH. This all appears fine, as the Switch 110 is just a mechanical / clockwork timer, it Appears to be working correctly.
Note that this is my second Switch 110, first one installed with the system stopped going round, just died stuck at one time and was replaced under warranty.
As the CH comes on independent of the timer in the middle of the night, and appears to work OK during the day, I'm wondering if it has something to do with the frost thermostat (but this is pure guess and probably wrong!).
The hot water demand is fine and the CH operates correctly when the timer requests that CH be turned on. There are no fault codes displayed on the status panel. If I check when the system turns itself on randomly, status d 8 = 1
Boiler is 2 and a half years old, I live in a hard water area, boiler has been regularly serviced since install.
Has anyone got any ideas, or seen this before?
Many thanks