164Honeywell
Honeywell 164 Error Code
Heat pump issue - requires technician
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Other Honeywell Error Codes
168
Wi-Fi radio faulty
173
Temperature sensor error
177
Indoor temperature sensor faulty
178
Outdoor temperature sensor faulty
E01
Wi-Fi setup error - router not found
E02
Invalid Wi-Fi password
E42
IP address issue (router DHCP problem)
E99
General error - disconnect and reconnect
2 Flashes
Pilot flame not detected - 5 min retry delay
3 Flashes
Flame failed during a run cycle
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5 Flashes
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