Lochinvar EcoShield SHW35-245CE Installation, Commissioning & Maintenance Instructions page 68

Error Codes
E11 Flame signal lost 4 times
Failed main burner ignition attempt 4
E12
times
The fan speed is being increased due
n05 to the flame current going below
5microcamps
The flue temperature has exceeded
E13
121
The flue temperature has exceeded
b05
115
The fan speed is being limited due to
n04 the flue temperature exceeding
100
The outlet temperature has exceeded
E15 the 98
setting
The outlet water temperature has
b03
exceeded 90
The fan speed is being limited due to
n02 the outlet water temperature
exceeding 85
The control module reads an
E18
excessive DT between the 2 sensors
One or both flue sensors is open or
E19
shorted
Continued over page
Description
C
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C
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C manual reset high limit
o
C
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C
o
Inspect spark electrode and associated wiring for damage and correct
connection, replace if required
Check for correct electrical earthing
Check incoming gas supply pressure is correct refer to section 9.0 gas
supply
Verify the plastic hose from the gas valve to the air inlet is connected and
undamaged
Verify the air intake/flue exhaust pipes are correctly installed and that there
are no obstructions
Check for 24v to the gas valve at the 2 pin connector on the side of the
main control board during ignition. If no voltage present replace the control
board
If 24v present at the main control board, check the wiring between the
board and the gas valve. Replace if required. Do not disconnect the wiring
from the gas valve and attempt to measure a voltage at that point, the
board will detect the gas valve is not connected and display a gas valve
fault.
If 24v is present check the gas valve is opening using a manometer
connected to the outlet of the gas valve. During pre-purge there should be
a negative pressure when the valve is energized there should be a positive
pressure. If these do not occur replace the faulty gas valve.
Inspect flame sensor and associated wiring, replace if required.
Inspect and clean the heat exchanger.
Inspect the burner and clean, replace if required.
Replace the main control board.
Inspect and clean the heat exchanger
Inspect the flue sensor, measure the resistance of the sensor and compare
with table .,replace if required
19.1
Verify the air intake/flue exhaust pipes are correctly installed and that there
are no obstructions
Replace the main control board.
Verify the system is full of water and all air has been purged from the
system, pay particular attention to the EcoShield™ heat exchanger
Verify the water heater has been piped correctly
Check the shunt pump is operating, if not check wiring back to the main
control board
Replace the main control board if required
If the wiring is Ok and there is 230v to the pump replace the pump
Check resistance of water sensors with table
required.
Check wiring to sensor, make sure all is correctly connected and
undamaged
Check resistance of water sensors with table
required.
Replace control module
Inspect the flue sensors, measure the resistance of the sensors and
compare with table .,replace if required
19.1
Replace control module
Corrective Action
, replace sensor if
19.1
, replace sensor if
19.1
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