Vaisala HMP7 - Page 64

• Critical errors are fatal to the operation of the device. It may not be able to respond to
communication at all, and will not measure correctly.
• Errors prevent normal operation of the device. Depending on the problem, errors may
resolve themselves. For example, a completely wet humidity sensor may cause a humidity
measurement error.
• Warnings do not prevent normal operation but may indicate possible problems.
• Status indicates a known state of the device.
Error message Description Recommended action
Critical errors
Firmware checksum mismatch Firmware is corrupted Contact Vaisala technical
support
Factory default settings
corrupted
Parameter memory is
corrupted
Main configuration settings
corrupted
Additional configuration
settings corrupted
Device settings corrupted
Sensor coecients corrupted
Non-volatile memory read
write failure
Hardware fault
Errors
Temperature measurement
error
Readings from sensors missing
or out of range
Inspect probe head and
sensors visually. If the probe is
completely wet, allow it to dry
out.
If the sensors are damaged or
missing and the error
message(s) stay active, contact
Vaisala to have the probe
repaired.
Humidity measurement error
Humidity sensor failure
Capacitance reference error Hardware fault Contact Vaisala technical
support
Ambient temperature out of
range
Probe body too hot or cold Relocate the probe body so
that its ambient temperature is
within the specified operating
range
Supply voltage out of range Supply voltage too high or low Check supply voltage
Sensor heater error Hardware fault Contact Vaisala technical
support
HMP Series with MMP8 and TMP1 User Guide M212022EN-F
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