Elecraft K3 Owner's Manual - Manual (Page 69)

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ERR EE2 External EEPROM read/write test failed EEPROM may be defective (front panel).
However, this message may also appear if
power is turned off/on too rapidly, or if the
power supply voltage “bounces” during
turn-on due to inadequate regulation. If the
power supply is not at fault, try re-loading
MCU firmware first; then try initializing
parameters (pg. 66).
ERR FP3 Missing display text in flash memory Try re-loading FPF (flash memory).
ERR FW2 General firmware problem Try re-loading MCU firmware first; then
try initializing parameters (pg. 66).
ERR IF1 RF board IF GROUP not responding (A6810
or KNB3-U2) *De-install the KNB3 module on RF
board. Note: The K3 cannot be operated
without a KNB3, because this module
includes T-R switching circuitry. Do not
attempt to bypass it using jumpers.
ERR IF2 Sub RX IF GROUP not responding (A6810 or
KNB3-U2) *De-install the KNB3 module on KRX3
first (tap SUB when in the KNB3 menu
entry). Note: The sub receiver can be
operated without a KNB3 if a jumper is
placed between pins 1 and 7 of J78 on the
KRX3 module.
ERR IO1 MISO line stuck low (asserted) *De-install option modules one at a time.
If no failing option module can be found,
there may be a problem on the RF board.
ERR IO3 KIO3 not responding The KIO3 may be defective. Note: The K3
can be operated temporarily without the
KIO3 installed. You’ll need to use
headphones, and there will be no computer
or AF I/O available on the rear panel.
ERR KEY
ERR PTT
Attempt to key the transmitter or activate PTT
during power-on Usually caused by an external device
shorting KEY or PTT to ground;
disconnect such devices until they’re
initialized properly. Also see
CONFIG:PTT-KEY. If necessary, try
removing the KIO3 module or its digital
I/O daughter board.
ERR LPF No response from LPF shift registers *De-install option modules one at a time.
If no failing option module can be found,
there may be a problem on the RF board.
ERR PA1 KPAIO3 module not responding *De-install the KPA3 module and set
CONFIG:KPA3 to
PAI O ON . If this
eliminates the error message, the problem
is likely to be on the KPA3 module. If not,
the problem may be on the KPAIO3
module; remove it as well, and set
CONFIG:KPA3 to
NOT INST .