Hub Controller options
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Yes, an electrician could check if the boiler has a permanent live or is just switched live fired. He could also check if the CH relay terminals in the Tado, (Com and NO) are permanently fused together. If you operate the Tado receiver from the app, on and off, you should see the indicator light on the receiver light up and go off, this one below.Test this out.
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Is this a wired stat or a wireless with receiver? See @Banjo Carney above who's had this twice,but his boiler is continuously on. He had the first tado replaced under warranty, but without establishing the failure reason ( software, comms freeze, or stuck relay).
A little overrun can occur when the temperature is reduced below target, I'd sometimes notice the lag between dropping the stat temperature below current and the boiler ceasing burning. Same goes for the opposite, turn it up and their can be lag of multiple seconds before it fires. I've never had a situation where the boiler just continued firing past the set temp for long periods. Note that is easy to accidentally push the stat app into manual boost while handling the phone. If you then close the screen. You won't really know that the set temperature is being exceeded.
There is also the situation where the Tado calculates the rate of cooling, and will fire in modulated bursts on a descending temperature graph, even though the current temp is higher that set. This prevents actual temperature falling much below set, as it charges the system with bursts of hot flow sufficient to arrest the drop in temperature before it passes the setpoint. All very smart. Heres an example,
At 13.52 boiler fires briefly though temperature of 20.3° is above setpoint of 20°.
In a manual mode, boosting time from turning up the wall stat may not be on a timer, but until the next scheduled change, which could be hours ahead. If you go to the graph, you can run your finger along the temperature line, and you'll see the set and actual temperatures, and where it was scheduled, away mode, manual, and loss of connection to the server. This might explain why sometimes the boiler keeps firing, generally the stat goes into manual mode for an Internet or server outage, and stays on the last setting until manually changed . Loss of comms between the extension kit receiver and the bridge and stat may also be at fault.
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You can see on the tado if its calling for heat. The three wavy bars will be lit, 1 to 3 depending on the level of on/off modulation. If the 'Inside now' temperature exceeds the programmed temperature these will be off. If the boiler is continuing to fire though the stat is off, then there is some reason Switched Live is being sent to the boiler. If the Tado relay or the extension kit CH relay are still closed, though the wavy lines/led on the ext. Kit show off, then either the Tado contacts are fused together, some other contacts down the line say in a zone valve, or else there is some other old stat or timer that hasn't been disabled and is still influencing the boiler firing. On the image below the 'inside now' is well over set, because its a warm day, and the house heats beyond the CH setting, which is never exceeded at this time of year. In winter, the set is sometimes exceeded when the solid fuel stove is burning, this is unregulated and can heat the room beyond the CH setting. Again, the CH will remain inactive until actual room temperature cools below set. Also, check that you haven't an offset programmed into your settings. This is used where a poorly located stat doesn't accurately reflect room temperature (mounted on a cold outer wall or near an exterior vent).
Post edited by deezell on0 -
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