2928
Code Indication
Remedy
sudden event such as
excessively low pressure in
water supply or excessively high
gas supply pressure.
2. The temperature controller or
the high temperature fusible
protection wire has separated.
2. Replace the fusible protection
wire.
E6 Solenoid valve error.
1. The wiring is loose or a bad
connection occurred.
2. The solenoid valve is faulty.
3. Controller has failed.
1. Mount plug-in wiring properly and
replace bad elements.
2. Replace solenoid valve.
3. Repair or replace the controller.
E8 Exhaust system error.
1. Wiring harness or wiring
connection somewhere in air
pressure switch connection has
come loose.
2. Exhaust(air intake) ducts is
jammed.
3. The pressure vent is jammed.
4. The wind pressure switch is
damaged.
5. Too many elbows or too long
vent pipes caused excessive
exhausting resistance.
1. Plug the plug-in element in place,
or replace the bad element.
2.Replace and/or clean Exhaust(air
intake) ducts.
3. Replace and/or clean the vent.
4.Replace the wind pressure
switch.
5.Choose proper location for
terminal installation, and follow the
instruction about Max Vent length to
choose right number of elbows and
length of total vent pipes.
Code
Indication Remedy
2.Ignition sequence was
unsuccessful.
3.An accidental flameout
occurred.
4.The ignition and flame
detection circuitry malfunctioned
or broke down. Igniter is not
activating.
5. Wrong gas type is used.
2. Check fuel gas supply (especially
when first installed as air pockets
might exist in the gas line. Retry the
ignition process several times).
3. Check if the fuel gas pressure is
too high or too low
4. Replace or repair igniter or flame
detection system.
5.Check the gas type, if the gas type
that the building is supplied with is
not the one indicated in rating plate
on unit, contact the dealer for the
proper unit to match the gas type
E3
Inlet water temperature
sensor problem.
Same possible causes
described in Section E1.
Same troubleshooting methods
described in E1.
E4 High temperature automatic
shutdown.
For ten (10) seconds a water
temperature above 185ºF
(85ºC) was detected. The
controller has automatically
closed the electromagnetic
valve and unit shut down.
Normal safety precaution to protect
against a rare occurrence in which
unit is enabled and then the water
flow is dramatically reduced
causing a small slug of very hot
water.
E5 Overheating occurred
1. Overheating occurred.
Possible causes include
operating at a very high load for
a long period and then there is a
1. Normal system function. This
should be a very infrequent event.
Correct gas or water supply issues
if there are frequent reoccurrence.
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