Service manual

– 15 –
Error Descriptions and How to Reset
Closed circuit (no open or short)
Connector No.
CN-89
1
Normal Value
Normal Value
Closed circuit
DC14 – 16V
DC14 – 16V
DC14 – 16V
Closed circuit
(not open or shorted)
2
6
1
BK/BL-R
BL-R
BL-BL
4
2
<After Pressing the Power On/Off Button on the Remote Controller>
1. If the Power On/Off lamp does not come on:
Error
Code
No
Error Code
10
760
90
99
Possible Causes Checkpoint
Error
Code
Possible Causes Checkpoint
Check voltage supply from circuit board to
remote controller.
Check for open or short circuit.
Check remote controller and circuit board. Check
Remove the cause of excess current, then replace the 10A fuse.
If there is AC 100V supplied to the circuit board, but there is not DC 15V out of it,
the circuit board needs to be replaced.
Check for improper or damaged connections between the two boards, and for an
open circuit on the circuit board.
If voltage is abnormal, replace the circuit board.
If there is an open or short circuit, or a ground fault is detected, replace the cord.
Remote Control Terminal Block Voltage
Abnormality
Remote Controller Cord Abnormality
Connector No.
CN-102
CN-102
CN-89A
Pin No. &
Color Code
Pin No. &
Code Color
How to Fix Problem and Reset Unit
How to Fix Problem and Reset Unit
A blinking 10 indicates there has been a loss of gas input, b
ut combustion will
continue. In order to reset the unit, the power must be disconnected and
then reconnected.
If there is a voltage abnormality, replace the circuit board.
1
If this error code is displayed and the water heater has been in use for 5 years,
the unit has reached the end of its life cycle and should be replaced.
Closed circuit (no open or short)
Connector No.
CN-89A
2
1
2.The Power On/Off lamp lights, but an error code appears soon after:
Normal Value
10
760
90
99
Error
Code
Possible Causes Checkpoint
connection of remote control cord and cord to
circuit board.
.
.
Pin No. &
Code Color
.
Check maintenance monitor No.48. If the fan has increased its speed by 101
%
(3P : 104 %), the error code will flash but combustion continues. If the fan has
increased its speed by 102 %(3P : 105 %), the error code will flash and combustion stops.
If this error code is displayed and the water heater has been in use for 5 years,
the unit has reached the end of its life cycle and should be replaced.
If an open or short circuit or a ground fault exists, replace Remote Control cord.
If output fall is detected,the error code will flash and combustion stops.
This error code can be reset by turning the water heater OFF on the operation
panel. Remove the cause of the abnormal combustion.
2 or less
CN-38 31BL-BL25
14
Check for melting or improper connection of the overheat prevention device
(Thermal fuse).
Overheat Prevention Device
(Thermal Fuse)
If the overheat prevention device (Thermal fuse) has fused, it has been exposed to
temperatures in excess of 184°C. First fix the cause of the high temperature exposure
(hole in
heat exchanger, etc.) and then replace the overheat prevention device (Thermal fuse).
v v
v
Ω
A Fuse is Blown
Circuit Board Abnormality
Check whether the 10A fuse on the
circuit board is open.
Check the 15V ouput line from the
circuit board.
Check the 15V ouput line from the
circuit board.
DC13 – 16V1 BL-BL
If voltage is abnormal, replace the circuit board.
CN-89
3
Circuit Board Abnormality
Check the 15V ouput line from the
circuit board.
Connection line Abnormality
Combustion Abnormality
(Output fall)
Combustion Abnormality
(Warning Indication)
(Unit Shuts Off)
Combustion Abnormality
(Unit Shuts Off)
Check for abnormal combustion.
Check flue for blockage or obstruction.
Combusiton Abnormality
(Unit continues burning with error code
flashing and drop in heat output)
Remote Controller Transmission
Abnormality
DC14 – 16VBL-BL
Check for abnormal combustion.
Check flue for blockage or obstruction.
Check the cause of output fall.
Check for abnormal combustion.
Check flue for blockage or obstruction.
Check for abnormal combustion.
Check flue for blockage or obstruction.
Check remote control cord for a short or open
circuit, or for a ground fault.