The meaning of the error codes differ from LCD and comms.
errors in comms:

Error Code	Failure Code	Solution
Err 01	TOKEN length error	Re-enter the TOKEN
Err 02	TOKEN's CRC error	Check the TOKEN with vending station
Err 03	TOKEN's TID error	Check the TOKEN with vending station
Err 04	Used TOKEN	Get another new TOKEN
Err 05	TOKEN is old	Get another new TOKEN
Err 06	Decoder Key is out of date for this TOKEN	Check with vending station
Err 07	Remained energy plus purchased energy is more than purchased accumulation threshold	When lower than threshold, input this TOKEN again
Err 08	All of the Class 3 TOKENs are reserved	Check with vending station
Err 09	TOKEN doesn?t match this meter?s Manufacturer Code	Check with vending station
Err 10	The value of Power threshold to be set is out of range.	Check with vending station
Err 11	This TOKEN of Class 2 is reserved	Check with vending station
Err 12	Purchased energy is more than limited	Check with vending station
Err 13	The Decoder Key Register contains DDTK, no purchase operation permitted	Check with vending station
Err 14	Doesn?t meet the key change rule, key change TOKEN is rejected.	Check with vending station
Err 15	This TOKEN is not for electricity meter.	Check with vending station
Err 16	Reserved or nonuse	Check with vending station
Err 17	This TOKEN is made earlier than the meter produce	Check with vending station
Err 18	Meter in terminal cover opened status, no TOKEN operation permitted	Install the terminal cover and then input TOKEN again
Err 19	TID illegal (the reserved TID, TID is 00:00:00 or 00:01)	Check with vending station
Err 20	Interval time of password setting is over	Input key change TOKEN again
Err 21	This TOKEN can?t use at running model	Check with vending station
Err 22	This TOKEN can only use at the running model	Check with vending station
Err 23	Meter already in prepaid model
Err 24	Meter already in postpaid model
Err 25	Keypad at lock model	Main display area show ?loC-out?
Err 26	Illegal operation	Check with vending station
Err 27	Meter already in current unbalance trip mode
Err 28	Meter already exit current unbalance trip mode
Err 29	Meter already in Calculate Error trip mode
Err 30	Meter already exit Calculate Error trip mode
Err 31	Generator detect mode cannot change paid mode
Err 32	Already forced relay open
Err 33	Already forced relay close
Err 77	Communication between DT2 meter & UIU failed	Re-pair meter with UIU

Additional Information on Error Codes
Error Information
When the meter has problems, the error code will automatically appear until the problem is fixed.
02: Memory fault: E-EECArd
03: Relay fault: E-rELAY
04: Clock default: E-dA1E 04
05: Battery low voltage: E-bA11 5
06: Measurement chip fault: E-CALI
07: current reverse: E-rEu
Relay Open Reason:
EA: Less than low voltage limit: undEr-U
EB: Over high voltage limit: ouEr-U
EC: Terminal cover opened: OP-CouEr
ED: Over power limit: ouEr-P
EE: No credit: nocredIt
EF: Strong magnetic: OP-Sn
FA:LOSS neutral wire: drop-n
FB: Open Meter Box: open-b
FC: Force Relay Open: F-open
FD: Meter not initialize: not-init
FE: Remaining credit level
FF:Generator input (Gen-in)

errors on LCD screen

Error code	LCD Display	Description
ERROR_SUCCESS	good	Success
ERROR_LENGTH	Err 01	Length error
ERROR_CRC	Err 02	CRC verify error
ERROR_TID_0	Err 03	TID=0
ERROR_USED	Err 04	TID used
ERROR_OLD	Err 05	TID error
ERROR_KEY_EXPIRED	Err 06	TID key expired
ERROR_RANGE	Err 07	Range error
ERROR_MFR_CODE	Err 09	MFR error
ERROR_DDTK	Err 13	Transfer credit not permitted for DDTK
ERROR_FORMAT	Err 15	Format error
ERROR_TID_EXPIRED	Err 17	TID expired
ERROR_TID_RESERVED	Err 19	Reserved TID
ERROR_TIME_OVER	Err 20	Time over
ERROR_FACTORY_MODE	Err 26	Factory mode error
ERROR_KRN	Err 30	KRN error
ERROR_FUNCTION	Err 36	Function error
ERROR_DITK_TO_DCTK	Err 40	DITK->DCTK illegal
ERROR_DDTK_TO_DITK	Err 41	DDTK->DITK illegal
ERROR_DDTK_TO_DCTK	Err 42	DDTK->DCTK illegal
ERROR_DUTK_TO_DITK	Err 43	DUTK->DITK illegal
ERROR_DUTK_TO_DCTK	Err 44	DUTK->DCTK illegal
ERROR_DCTK_TO_DITK	Err 45	DCTK->DITK illegal
ERROR_DCTK_TO_DDTK	Err 46	DCTK->DDTK illegal
ERROR_DCTK_TO_DUTK	Err 47	DCTK->DUTK illegal
ERROR_DCTK_TO_DCTK	Err 48	DCTK->DCTK illegal
ERROR_METER_REMOVED	Err 55	Meter removed
ERROR_CASING_OPENED	Err 56	Meter cover open
ERROR_SENSOR_ERROR	Err 57	Magnetic disturb
ERROR_POWER_WARN	Err 58	Battery under-voltage
ERROR_POWER_ERROR	Err 59	Valve closed as battery under-voltage

Tags: wasion

Short Code Query (to type in on keypad only)

Short Code	Description
000	Full screen display test
001	Relay connection/disconnection test
002	Display item b0: Full screen display
003	Display item b4: Keypad self-check
004	Display item 01: Total consumption of energy
005	Display item 37: KRN and KT display together
006	Display item b3: Tariff index (TI)
007	Display item 33: Maximum power limit
008	Meter box(optional), strong magnetic, meter cover and terminal cover status: Main display area:0011 From left to right there are 4 digit numbers shown on the meter box (reserved), strong magnetic, meter cover and terminal cover status. 0:Closing 1:Opening b6- Item No.
009	Display item 00: Remaining electricity, unit kWh
010	Display STS Version
030	Display item 46: SGC
031	Local keypad-lock timer state
032	Remote keypad-lock timer state
033	Relay close timer state
034	Meter status words. There are 3 digits from the left to right are: Digit 1: Installation mode (0), running mode (1) Digit 2: Prepaid mode (1), post-paid model(0) Digit 3: Detect neutral loss(1), Don?t detect neutral loss (0)
035	Neutral Current
036	Meter Payment words. There are 2 digits from the left to right are: Digit1:STEP mode (1) Digit2:TOU mode (1) If digit two is on, the meter is in currency mode. If none of the two are visible, the meter is in a prepaid mode.
037	Meter Trip words. There are 3 digits from the left to right are: Digit1:Power off trip(1) Digit2:Current Unbalance trip(1) Digit3:Caculate Error trip(1)
050	Display item 60, Active power
070	Display item 00, meter box (reserved), strong magnetic, meter cover, terminal cover status. Display in main area:0011 From left to right there are 4 digits shows the meter box, strong magnetic, meter cover and terminal cover status. 0:Closing 1:Opening Display item 01, rated voltage Display item 02, rated current Display item 03, baud rate Display item 04, Metering software revision
071	Display item 00, trip delay of over load, unit: second Display item 01, switch delay of over load(short trip), unit: second Display item 02, short trips period, unit: minutes Display item 03, short trip times limit, if exceed this limit, meter will enter into long trip state. Display item 04, switch delay of overload(long trip), unit: minute Display item 05, trip delay of low voltage, unit: second Display item 06, trip delay of high voltage, unit: second Display item 07, switch delay of Low voltage, unit: second Display item 08, switch delay of high voltage, unit: second
072	Display item 00, last voltage out of tolerance time Display item 01, Last voltage out of tolerance date
073	Display item 00, Power factor Display item 01, Active power Display item 02, reactive power Display item 03, Apparent power Display item 04, Last 1st month average power factor Display item 05, Last 2nd month average power factor Display item 06, Last 3rd month average power factor
074	Display item 00, Total reactive energy Display item 01, Total apparent energy Display item 02, Forward reactive energy Display item 03, Reverse reactive energy Display item 04, Forward apparent energy Display item 05, Reverse apparent energy
075	Display item 00, The days used energy last 30 days Display item 01, Total energy consumed in the last 30 days Display item 02, Average daily consumption in the last 30 days Display item 03, Average monthly consumption in the last 12 month Display item 04, Total used energy in last 24hours Display item 05, Average hourly consumption in the last 24hours Display item 06,Current month used energy
100	Display item 47: Manufacturer code 48: DSN 49: DRN check code
101	Display item b8: Software revision display
200	Display the last credit token value and entering time & date
202	Display the last 2nd credit token value and entering time & date
204	Display the last 3rd credit token value and entering time & date
248	Display the last 25th credit token value and entering time & date
201	Display the last credit token's TID information
203	Display the last 2nd credit token's TID information
205	Display the last 3rd credit token's TID information
249	Display the last 25th credit token's TID information
250	Display the last credit token(20 digits)
251	Display the last 2nd credit token(20 digits)
252	Display the last 3rd credit token(20 digits)
274	Display the last 25th credit token(20 digits)
275	Last 1st terminal cover open date and time
276	Last 2nd terminal cover open date and time
277	Last 3rd terminal cover open date and time
278	Last 4th terminal cover open date and time
279	Last 5th terminal cover open date and time
280	Last 1st TI changed date and time, also the TI before changed
281	Last 2nd TI changed date and time, also the TI before changed
282	Last 3rd TI changed date and time, also the TI before changed
400(Do not have In STEP mode)	Display item 00, Tariff numbers(Max 8 rates) Display item 01, Tariff 1 price, unit: $, 4 decimals Display item 02, Tariff 2 price, unit: $, 4 decimals Display item 03 Tariff 3 Price, unit: $, 4 decimals Display item 04 Tariff 4 Price, unit: $, 4 decimals Display item 05, Tariff 5 price, unit: $, 4 decimals Display item 06, Tariff 6 price, unit: $, 4 decimals Display item 07, Tariff 7 price, unit: $, 4 decimals Display item 08, Tariff 8 price, unit: $, 4 decimals
401(Do not have In STEP mode)	Display item 01, Tariff 1 consumption, unit: kWh Display item 02, Tariff 2 consumption, unit: kWh Display item 03, Tariff 3 consumption, unit: kWh Display item 04, Tariff 4 consumption, unit: kWh Display item 05, Tariff 5 consumption, unit: kWh Display item 06, Tariff 6 consumption, unit: kWh Display item 07, Tariff 7 consumption, unit: kWh Display item 08, Tariff 8 consumption, unit: kWh
402-409(Do not have In STEP mode)	Display item 00, QTY of day-intervals (Max 14 dayintervals) Display item 01, Day-interval 1 define, format: HHMMNN Display item 02, Day-interval 2 define, format: HHMMNN Display item 03, Day-interval 3 define, format: HHMMNN Display item 04, Day-interval 4 define, format: HHMMNN Display item 05, Day-interval 5 define, format: HHMMNN Display item 06, Day-interval 6 define, format: HHMMNN Display item 07, Day-interval 7 define, format: HHMMNN Display item 08, Day-interval 8 define, format: HHMMNN Display item 09, Day-interval 9 define, format: HHMMNN Display item 10, Day-interval 10 define, format: HHMMNN Display item 11, Day-interval 11 define, format: HHMMNN Display item 12, Day-interval 12 define, format: HHMMNN Display item 13, Day-interval 13 define, format: HHMMNN Display item 14, Day-interval 14 define, format: HHMMNN (HH means hour, MM means minute, NN means tariff code(01~08))
410(Do not have In STEP mode)	Display the week table Display item 00, QTY of week table (Max 8 week table) Display item 01, week table1 Format:DDDDDDD Display item 02, week table1 Format:DDDDDDD Display item 03, week table1 Format:DDDDDDD Display item 04, week table1 Format:DDDDDDD Display item 05, week table1 Format:DDDDDDD Display item 06, week table1 Format:DDDDDDD Display item 07, week table1 Format:DDDDDDD Display item 08, week table1 Format:DDDDDDD (DDDDDDD Left to right is day-table number of Monday to Sunday)
420(Do not have In STEP mode)	Display the Season table Display item 00, QTY of Season table (Max 14 Season table) Display item 01,Season table1 Format:MMDD.NN MM Display item 02,Season table2 Format:MMDD.NN MM ... Display item 013,Season table3 Format:MMDD.NN MM Display item 014,Season table4 Format:MMDD.NN MM (MM Month,DD Day,NN Week number)
430-437(Do not have In STEP mode)	Display the Holiday table Display item 00, QTY of Holiday(Max 13 Holidays) Display item 01, Holiday1 Format YYMM.DD:NN Display item 02, Holiday2 Format YYMM.DD:NN ... Display item 12, Holiday12 Format YYMM.DD:NN Display item 13, Holiday13 Format YYMM.DD:NN YY Year,MM Month DD Day,NN Daytable number
500(Only in STEP mode)	Display the STEP price table Display item 00, QTY of Energy-prices(max 10) Display item 01, Energy price1 Unit $ Display item 02, Energy price2 Unit $ ... Display item 09, Energy price9 Unit $ Display item 10, Energy price10 Unit $
501(Only in STEP mode)	Display the STEP energy table Display item 00, QTY of Energy-steps(max 9) Display item 01, Energy step1 Unit kwh Display item 02, Energy step2 Unit kwh ... Display item 08, Energy step8 Unit kwh Display item 09, Energy step9 Unit kwh
600	Display the change time of the main and backup tariff table Display item 00,TOU time table change time(STEP Energy table change time in STEP mode) Format: Hour: Minute: Second Display item 01,TOU time table change date(STEP Energy table change time in STEP mode) Format: Year-Month-Day Display item 02, TOU price table change time (STEP Price table change time in STEP mode) Format: Hour: Minute: Second Display item 03, TOU price table change date (STEP Price table change time in STEP mode) Format: Year-Month-Day
601	Display item 00,Current Tariff number Display item 01,Current Tariff Unit: $ Display item 02, Current Day table number(Only in TOU mode) Display item 03, Current Week table number(Only in TOU mode)

I want to unpair my wasion prepaid meter from it uiu

Tags: commissionedprecomissioningwasion

AFAIK you just pair it with the new one.