Yamaha RX-V 2300 Receiver turns on & then turns off within 1 second. DIAG displays: TMP PRT: 311 F

Receiver turns on then off within 1 second. When starting amp diagnostics DIAG the history of protection function displays TMP PRT:309 F.
The protection function worked due to the temperature limit being exceeded.
Causes could be a defect related to the thermal sensor. Temperature detected value(Normal value: 51 to 158)
I measure thermsistor input is 5.25VDC, output is 3.23VDC. It is seem that output is higher normal value. Could anyone
help me solve this issue?