FortiGate Next Generation Firewall utilizes purpose-built security processors and threat intelligence security services from FortiGuard labs to deliver top-rated protection and high performance, including encrypted traffic.
This article describes the typical circumstances behind the 'Temperature too low'.
Scope
FortiGate.
Solution
The sample system event message will be looked like below:
level="warning" logdesc="Temperature too low" logid="0100022152" logver=604132092 msg="Fan Temperature temperature is too low: -1000.00 (-30.0 celsius degree)" status="failure
This message says the Fan's temperature is too low. Too low a temperature can cause many problems, such as problems with hard drives and the power supply.
Use the following debug command to check the actual temperature of the hardware unit:
execute sensor list 1 PSU [1] LOST 2 PSU [2] OK 3 SYS Fan1 Speed 5192 RPM 4 SYS Fan2 Speed 5192 RPM 5 Ext Temperature 38875.00 C WARNING! <<<===== 6 Fan Temperature 30000.00 C WARNING! <<<===== 7 CPU_ON-DIE Temperature 41.97 C 8 BCM_switch Temperature 49.00 C 9 B50185 Temperature 66.50 C 10 B50210_1 Temperature 36.86 C 11 B50210_2 Temperature 39.08 C
Additional Notes:
Always check the FortiOS firmware version as it could be a bug issue if it is using v7.2.3. Initiate a TAC ticket to confirm whether it is a bug-related issue or upgrade to v7.2.4 and above to mitigate it.
Just check the temperature reading again after the upgrade.
Consider RMA the unit after confirming that the issue persisted.
