67
Boiler Manual
PART 12: TROUBLESHOOTING
(CONTINUED)
powered on and the temperature of the water at
the supply sensor is too high for the boiler to
ignite. This occurs because the water tempera-
ture measured by the supply sensor is higher
than the DHW SETPOINT – DHW DIFF SET-
POINT, when a demand from the DHW circuit is
placed on the boiler. When there is a demand
from the DHW circuit, this message will stay
present until the water temperature measured
by the supply sensor is less than the DHW SET-
POINT – DHW DIFF SETPOINT.
Fault Code FOU
OUTDOOR SENSOR
PUMP ON
FOU
Description:
This display indicates that the outdoor sensor is
defective (either shorted or open) or the outdoor
temperature is below –40 degrees Fahrenheit.
NOTE: The installer must choose YES for
parameter 21 to enable this feature. The boiler
will continue to operate when this error is dis-
played and the control will ignore the outdoor
reset feature and run at the programmed boiler
temperature. The bottom line of the display will
indicate the status of the pump.
Remedy:
Inspect the wiring from the outside sensor for
damage or shorted connections and repair as nec-
essary. Measure the resistance of the outdoor sen-
sor and compare it to resistance chart. If not with-
in the range on the chart, replace the sensor.
Fault Code E07
FLUE TEMP HIGH
PUMP OFF
E07
Description:
This display indicates that the flue sensor tem-
perature is excessive and above 210 deg. F.
When this code is displayed, the boiler will not
respond to a demand for heat. When the flue
temperature decreases below 194 Deg. F, the
display will return to normal and allow the boil-
er to respond for a demand to heat. The bottom
line of the display indicates the status of the
pump. The pump will remain off when this error
is displayed.
Remedy:
Check the flue for obstructions or any sign of
damage, especially signs of excessive heat.
Repair as necessary. Run the boiler and check
the flue temperature with an external ther-
mometer. If the flue temperature on the ther-
mometer does not agree with the flue tempera-
ture displayed in the status menu, inspect the
wiring to the flue temperature sensor in the boil-
er and repair as necessary. If the wiring is intact,
replace the flue sensor. If the flue temperature is
excessive on the status menu and the test ther-
mometer reads the same, check and adjust
combustion controls on the boiler. If the prob-
lem persists, inspect the target wall in the com-
bustion chamber and replace it if cracked or
damaged.
Fault Code E19
LINE VOLTAGE
PUMP OFF
E19
Description:
This display indicates that the line voltage fre-
quency is out of range. This could happen if the
boiler is being powered from a small gasoline
powered generator that is not functioning cor-
rectly or overloaded.
Remedy:
Inspect power wiring to boiler and repair as nec-
essary. If connected to line voltage, notify the
power company. If connected to an alternate
power source such as generator or inverter,
make sure the line voltage frequency supplied
by the device is 60 Hz.
Fault Code FLU
HIGH FLUE PRESS
PUMP ON
FLU
Description:
This display indicates that there is excessive flue
pressure. This code will reset automatically after
the high pressure condition is resolved. The sec-
ond line indicates the status of the pump.
Remedy:
1. Assure that the flue is not blocked
2. Check the switch wiring by applying a
jumper in place of the switch. If the code
clears with the jumper in place, REPLACE the
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