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Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 5648
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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What is Error 42 on my Honeywell WiFi Thermostat? I can no

Customer Question

What is Error 42 on my Honeywell WiFi Thermostat? I can no longer access from my iPhone.
Submitted: 1 year ago.
Category: HVAC
Expert:  BillyHvac replied 1 year ago.
this is a router issue communicating.
1 - make sure your wifi/router is operating properly
2- remove thermostat from wall plate for 10 seconds and reinstall
If 42 remains after 30 minutes there is an issue with the router connecting to stat

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