Operator`s manual

NOTE: In all cases you may be able to clear the Error Message simply by turning the hot water tap OFF, then ON
again. If this does not clear the Error Message, try pushing the ON/OFF button OFF, then ON again. If the Error
Message still remains, contact our service center or your nearest service agent and arrange for a service call.
[phone]
8am-5pm EST, Monday through Friday
49
DIAGNOSTICS
Code display
Cause Remedy
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Check the intake thermistor
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Check wire connection of 14p wire and thermistor wire
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Check the intake thermistor
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Check wire connection of 14p wire and thermistor wire
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Check the room A thermistor
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Check wire connection of 12p wire and thermistor wire
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Check the room A thermistor
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Check wire connection of 12p wire and thermistor wire
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Check the room B thermistor
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Check wire connection of 12p wire and thermistor wire
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Check the room B thermistor
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Check wire connection of 12p wire and thermistor wire
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Check gas valve
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Check connection of gas valve wire
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Check flow sensor
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Check recirculation pump and loop
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Check connection of 14p wire and flow sensor wire
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Check wire connection of 8p wire and pump wire
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Check the pump
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Check connection of 3p wire and MCU wire
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Check connection of termination wire and resistor(120
Ω
)
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Check connection of 3p wire and MCU wire
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Check connection of termination wire and resistor(120
Ω
)
E57
Pump is not connected
□Call service center
E40
Main RAM failure
□Call service center
A controller failure concerning
Subsidiary flame signal
E39
E41
E42
□Call service center
E38
Subsidiary RAM failure
□Call service center
Communication failure with
SUB CPU
□Call service center
E36
A controller failure
concerning gas valve
□Call service center
Rotation of a DC fan is
too low
E43
E31
E37
E54
E56
E48
E49
□Call service center
Room A Thermistor Short
(only hydro heating)
Intake Thermistor Detect
Abnormal Situation
Master can't have any data on
CAN line
Room A Thermistor Open
(only hydro heating)
R
oom B Thermistor Short
(only hydro heating)
Room B Thermistor Open
(only hydro heating)
Current Leak on Gas Valve
Power
Less than 0.3gpm of water
flow at recirculation mode
and hydro heating
□Call service center
Main ROM failure
Main MUX error
□Call service center
□Call service center
A controller failure concerning
flame signal
E94
Sub can't have any signal from
master
E47
Intake Thermistor Open
Intake Thermistor Short
E50
E93
E51
E52
E53
● Error Code Diagnosis