Weak Low-Voltage Transformer – Starving the Controls

The 24-volt transformer powers every control signal in your HVAC system. When it weakens, relays chatter, contactors buzz, and thermostats misbehave.
Chatterbox monitors voltage stability on the low-voltage circuit; a steady 19–20 V under load is a clear sign of trouble.
Replacing the small transformer restored clean power to every control—proof that even a $30 part can make a big difference.