
LP-517 Rev. 000 Rel. 019 Date 7.21.20
54
The following blocking codes will block operation until the control determines the situation safe for boiler operation.
LOW WATER FLOW FL
PUMP OFF 4:32P
This indicates the flow switch is not
activated.
1. Ensure boiler contains water and all valves are open.
2. Check the boiler circulator and ensure it is in good operating
condition (operating, wiring intact, etc.).
3. Inspect the wiring to the flow switch for damage and repair as
necessary.
4. Disconnect one wire from the flow switch and test for continuity
across the switch while flow is confirmed to be present.
5. Remove flow switch and inspect switch paddle for proper
operation.
FLUE TEMP HIGH E07
PUMP ON TIME
This display indicates that the flue sensor
temperature is above 210
o
F. When this
code is displayed, the boiler will not
respond to a demand for heat. When
the flue temperature decreases below
194
o
F, the display will return to normal
and allow the boiler to respond to a
heat demand. The bottom line indicates
the status of the pump. The pump will
remain on when this error is displayed.
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 thermometer. If the
flue temperature on the thermometer does not agree with the flue
temperature displayed in the status menu, inspect the wiring to the
flue temperature sensor in the boiler 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 thermometer reads the
same, check and adjust combustion controls on the boiler.
TEMPER BLOCKING TT
PUMP ON
TT indicates there is a demand for heat
on the boiler, the pump is powered on,
and the supply sensor temperature is
too high for the boiler to ignite. This
occurs because the water temperature
measured by the supply sensor is higher
than the tank temperature – ignition diff
setting.
This message will stay present until the water temperature measured
by the supply sensor is less than the tank temperature – ignition diff
setting.
TEMPER BLOCKING
PUMP ON
This screen indicates a demand for
heat from the DHW circuit. The pump
is powered on and the supply sensor
temperature is too high for the boiler
to ignite. This occurs because the
water temperature measured by the
supply sensor is higher than the tank
temperature – ignition diff setting.
NOTE:
If there is a CH demand while this
screen is displayed, the screen may read:
TEMPER BLOCKING PRIO
This message will stay present until the water temperature measured
by the supply sensor is less than the BOILER SUPPLY – boiler supply
differential (5
o
F) or DHW SETPOINT is satisfied and no longer calls
for heat.
HIGH FLUE PRESS FLU
PUMP ON
FLU indicates excessive flue pressure.
This code resets automatically after the
high pressure condition is resolved. The
second line indicates pump status.
1. Assure 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 flue
switch and connect the wires to the new switch BEFORE running
boiler.
WARNING:
Do not use jumper to remedy an FLU error. Faulty switch MUST be replaced. Failure to follow this instruction could result in
serious personal injury or death.
FLUE TEMP HIGH E07
PUMP OFF TIME
E07 indicates the flue sensor temperature
is excessive and above 210
o
F. When E07
is displayed the boiler will not respond
to a demand for heat and begin to
modulate down on vent temp rather
than supply temp.
During reduced modulation, the display
will show VENT RED MODULATION, and
the second line will alternate between
PUMP ON TIME and the actual vent
temperature.
When the flue temperature decreases
below 194
o
F, the display will return to
normal and allow the boiler to respond
to a heat demand.
1. Check the flue for obstructions and any sign of damage, especially
signs of excessive heat. Repair as necessary.
2. Run the boiler and check the flue temperature with an external
thermometer. If the flue temperature on the thermometer does
not agree with the flue temperature displayed in the status menu,
inspect the wiring to the flue temperature sensor in the boiler and
repair as necessary. If the wiring is intact replace the flue sensor.
3. If the flue temperature is excessive on the status menu and the test
thermometer reads the same, check and adjust combustion controls
on the boiler.