lp-657 Rev. 001 Rel. 000 Date 12.10.18
55
D. User Interface Display
Cascade Control Fault Codes
Screen
Description
Possible Remedy
SYS SUPPLY SENSOR
PUMP OFF E03
E03 indicates a problem with the system
sensor circuit. The circuit could be open or
shorted. Possible reasons for this error are:
There is no system sensor connected to the
Master Boiler.
The system sensor is faulty.
There is a short circuit in the system sensor
wiring; possibly from a staple placed through
the wire, or damage to the wire causing both
conductors to touch.
The system sensor wiring is open due to
defect or damage.
Disconnect the system sensor from the wiring and
measure it’s resistance. Compare the measured resistance
to the table in this manual to see if it corresponds to the
temperature of the sensor. If the resistance does not
agree with the sensor, replace the sensor. If the sensor
is OK, disconnect the sensor wiring from both the boiler
and the sensor and check continuity using an ohmmeter.
Repair or replace as necessary.
If this error is present, the boilers in the cascaded group
will run and ignite simultaneously when there is a heat
demand. Each boiler will modulate to maintain set
point temperature on its own supply sensor. This code
automatically resets when repair is complete. This code
will not display if system setting function ERROR SYSTEM
SENS is set to OFF.
TEMPER BLOCKING
PUMP ON TT
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 boiler temperature
– ignition diff setting.
This message will stay present until the water temperature
measured by the supply sensor is less than the boiler
temperature – ignition diff setting.
TEMPER BLOCKING
PUMP ON DHW
This display indicates a temporary hold on
the burner. There is a demand on the boiler
from the DHW circuit for heat, the pump is
powered on, but the boiler supply sensor
indicates that the water temperature is too
high to ignite. This is a temporary hold on
the burner only and all other functions will
remain functioning properly.
This error will clear itself when either the boiler supply
temperature drops below the BOILER SUPPLY minus
boiler supply differential (5
o
F) or DHW SETPOINT is
satisfied and no longer calls for heat.
LOW WATER PRESS
PUMP OFF PRO
PRO indicates low water pressure in the
boiler. This code will reset automatically after
the water pressure is high enough for the
boiler to run safely. The second line indicates
the status of the pump. Note that while the
water pressure is low, the pump will be off.
1. Assure that the system pressure is above 10 psig.
2. Check for leaks in the system piping.
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.
Summary of Contents for Elite FT EFT-285
Page 22: ...lp 657 Rev 001 Rel 000 Date 12 10 18 22 Figure 9 Piping Symbol Legend ...
Page 41: ...lp 657 Rev 001 Rel 000 Date 12 10 18 41 Figure 31 Internal Connection Diagram ...
Page 66: ...lp 657 Rev 001 Rel 000 Date 12 10 18 66 Figure 36 Cabinet Replacement Parts ...
Page 69: ...lp 657 Rev 001 Rel 000 Date 12 10 18 69 Maintenance Notes ...