LP-428 Rev. 6.6.16
50
DO NOT USE THIS APPLIANCE IF ANY PART HAS BEEN
SUBMERGED IN WATER. Immediately call a qualied service
technician. The appliance MUST BE replaced if it has been
submerged. Attempting to operate an appliance that has been
submerged could create numerous harmful conditions, such as
a potential gas leakage causing a re and/or explosion, or the
release of mold, bacteria, or other harmful particulates into the
air. Operating a previously submerged appliance could result in
property damage, severe personal injury, or death.
NOTE: Appliance damage due to ood or submersion is
considered an Act of God, and IS NOT covered under product
warranty.
When servicing or replacing components that are in direct
contact with boiler water, be certain that:
• There is no pressure in the boiler. (Pull the release on
the relief valve. Do not depend on the pressure gauge
reading.
• The boiler water is not hot.
• The electrical power is disconnected.
• The gas is shut o.
Failure to make these checks could result in substantial
property damage, serious personal injury, or death.
Label all wires prior to disconnecting them when servicing
the boiler. Wiring errors can cause improper and dangerous
operation. Failure to follow these instructions may result in
property damage or personal injury.
If overheating occurs or the gas supply fails to shut o, do not
turn o electrical power to the circulating pump. This may
aggravate the problem and increase the likelihood of boiler
damage. Instead, shut o the gas supply to the boiler at the
gas service valve. Failure to do so may result in property
damage, personal injury, or death.
NOTE: If system return temperatures are maintained below the
dew point, condensation will form on the inside of the boiler
cabinet and cause some internal sheet metal components to
rust.
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 tank temperature –
ignition di setting.
This message will stay present until the water temperature
measured by the supply sensor is less than the tank temperature
– ignition di setting.
LOW WATER LEVEL
PUMP OFF LEO
Water level in the boiler is low.
1. Check boiler feed water system to be sure it is supplying make-
up water to the boiler system.
2. Be sure all air is bled from the system.
3. Check for leaks in the boiler and system piping and repair as
necessary.
4. Inspect low level switch and wiring for damage and repair as
necessary.
HIGH FLUE PRESS FLU
PUMP ON
FLU indicates excessive ue pressure. This
code resets automatically after the high
pressure condition is resolved. The second
line indicates pump status.
1. Assure the ue 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
ue 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.
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