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No power to thermostat:
• Plug in boiler.
• Check thermostat wiring and
connection to boiler.
Blank Screen
Troubleshooting
Internal error thermostat
If an “E” with numerical code appears, there is a hardware error in
the thermostat. The thermostat will restart after 5 seconds. If this
error persists, the thermostat is defective and must be replaced.