Vaisala HMP260 - Manual (Page 113)

HMP260 SERIES
HMP260-U017en-1.5 Appendix 5: Error messages
The LEDs indicate these errors as follows:
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no frequency at all
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a frequency missing from the RH channel
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a frequency missing from the T channel
The second error type indicates erroneous y-values (used in internal calculations):
Display: Serial bus:
E51 T y-value out of range
E53 U1 y-value out of range
E54 U2 y-value out of range
The LEDs indicate these errors as follows:
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RH channel y-value out of range
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T channel y-value out of range