Trouble Shooting Flow Chart - Takagi MOBIUS Installation And Operation Instruction Manual

Start
Power On
①
Valve A opens
②
Valve B opens
⑰
Valve C opens
④
NO
Valve A
Open limit on
(After 18 sec.)
② YES
NO
Valve B
Open limit on
(After 18 sec.)
⑱
YES
Valve C NO
Open limit on
(After 18 sec.)
YES
Operation Switch ON
③
Display:
Display: Priority
④
NO
Valve A
Open limit on
(After 18 sec.)
YES
NO
Pre-check
Normal
YES
B
Faucet opened
NO
Flow Sensor
>0.75 GPM
⑧
YES
NO
Valve C
Close limit off
(After 18 sec.)
YES
NO
Set Temperature
<140F
①
YES
Control Valve B Open Valve B
Open Valve A
*1
C
Valve A failure
Circuit board for valve D.E.F Failure
⑤
High-limit switch off
Open Short:
⑥
Inlet Temp. Thermistor
Open Short:
Output Temp. Thermistor
Open Short:
Mixing Temp. Thermistor
Circuit board failure
Mismatched gas
Flame failure
Valve C failure
Valve C failure
Valve B failure
Abnormal fan rotation
Gas valve circuit
Output Temp. Termistor
Mixing Temp. Termistor
Valve B failure
Valve C failure
Circuit board
Abnormal High Temp.
Abnormal Burning
*2
*3 *5 *6
*4
High-limit switch
541
711
141
321
311
331
701
031
721
651
541
661
611
Fan off
111
Ignite failure
121
Lost flame
510
Valve H failure
711
board failure
321
Open Short:
Inlet Temp. Thermistor
311
Open Short:
Open Short:
331
661
651
701
991
141
Maintenance
All display off
Power off
Operation switch off
Flow sensor off
Faucet closed
MOBIUS
Water Heater
Model T-M1
Trouble Shooting
Diagnosis
Flow - Chart
(After 35 sec.)
611
Fan off
Valve H off
Valve D off
Valve E off
Valve G off
Valve F off
*13