LP-551 Rev. 3.9.16
49
DO NOT USE THIS APPLIANCE IF ANY PART HAS BEEN
SUBMERGED IN WATER.
Immediately call a qualified 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 fire 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 flood or submersion is
considered an Act of God, and IS NOT covered under product
warranty.
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 off, do not
turn off electrical power to the circulating pump. This may
aggravate the problem and increase the likelihood of boiler
damage. Instead, shut off 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 E03
PUMP OFF 12:56P
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.
SUPPLY SENSOR F02
PUMP ON TIME
The dual supply sensor contains two
sensing elements within a single body. F02
indicates that one or both halves of the
supply temperature sensor has failed OR the
difference between the dual sensor readings
is greater than 18
o
F. This is a serious safety
issue and the boiler will not restart until the
sensor is replaced by a technician and he
pushes the RESET button on the display.
This situation is indicated by the red light on
the display and the flashing word LOCKOUT.
During this lockout fault, the pump will be on
as indicated on the second line of the display.
1. Check the electrical connections to each half of the
sensor on the outlet manifold. Verify 5 VDC by checking in
Molex connector. If there is not 5 VDC, check the harness.
If harness and sensors are OK, replace control.
NOTE: The boiler will reset automatically. Verify sensor
resistance values of each half of the dual sensor by
referencing chart in this manual.
2. Replace thermistor if necessary.
RETURN SENSOR F03
PUMP ON TIME
F03 indicates the return temperature sensor
of the boiler has failed. The boiler will not
restart until a technician replaces the sensor
and pushes
RESET
on the display. This is
a serious safety issue as indicated by the
illuminated red light and the word LOCKOUT
flashing on the display. During this lockout
fault, the pump will be on.
1. Check circulator pump operation.
2. Ensure adequate flow through the boiler by accessing
the status menu and determining there is less than a 50
o
F
rise from the return thermistor to the supply thermistor.
3. Troubleshoot thermistor by following the steps in F02.
Summary of Contents for EP-220 VWH
Page 33: ...LP 551 Rev 3 9 16 33 Figure 24 Cascade Master and FollowerWiring ...
Page 34: ...LP 551 Rev 3 9 16 34 Figure 25 Internal Connection Diagram ...
Page 57: ...LP 551 Rev 3 9 16 57 Figure 30 Combustion System Replacement Parts 220kBTU Model ...
Page 58: ...LP 551 Rev 3 9 16 58 Figure 31 Combustion System Replacement Parts 299 399kBTU Models ...
Page 59: ...LP 551 Rev 3 9 16 59 Figure 32 Replacement Parts All Models ...
