Details of complaint: on (b)(6) 2019 customer stated gas unit dropped out intermittently.Nk repair center evaluated the device and noted device was giving "gas device error" on the monitoring device.Service requested: exchange.Service performed: exchange.Investigation result: the investigation under irc-nka300155492 concluded that for gf-210ra revision cb and onward with sensor unit cd-314p revision 2 (serial numbers (b)(6)) needed a firmware upgrade.Revision 2 of cd-314p utilize a new pump with a slight difference in specification.The sensor unit detects this small difference and output as gas device error.The resolution was to perform a firmware upgrade.For gf-210ra with older sensor unit cd-314p (no revision # = first revision), there was no tendency of sensor failing, thus the investigation provided no countermeasure.Due to no tendency of failure, it was determined these sensors failed as a result of normal usage.Cd-314p replacement is recommended.In summary, serial numbers(b)(6)and below has the first version of cd-314p.Serial numbers (b)(6) have version 2 of cd-314p.These units require firmware upgrade.Serial numbers above (b)(6) are not affected.The root cause of the error message on serial number 1262 was due to firmware requiring upgrade.
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