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Yes, I appreciate that it's not the right tool for the job Mat. I want to replace the thermostat as it's outdated, but I'm not familiar with the symols L <- and L -> and not convinced that the wiring colours are any indication of their use (yellow for L <- and red for L ->). The blue appears to...

Help needed. I have an old vaillant VRT manual thermostat (possibly an outdated VRT 30) with three terminals labelled L with an arrow symbol pointing in (yellow wire connected), which I premume means live. L with an arrow symbol pointing out (red wire connected) which I presume means switch live...