Lochinvar EcoShield SHW35-245CE Installation, Commissioning & Maintenance Instructions page 69

Error Codes
One or both outlet sensors is open or
E21
shorted
E22 Inlet sensor is open
E23 Inlet sensor is shorted
The temperature has reached the set
b01
point +4
The control has received a call for heat
b02 too soon after the previous call for heat
ended
The temperature rise across the heat
b04
exchanger has exceeded 30
The fan speed is being limited due to
n03 the temperature rise across the heat
exchanger exceeding 25
b06 Low voltage on main control board
The flue temperature did not change
n01
after the burner started firing
n06 Tank sensor is not connected
n07 Inlet sensor disconnected
n08 Inlet sensor shorted
ERROR CODES
b01 Set point met
b02 Anti-cycling
b03 Outlet temperature too high
b04 Delta T too high
b05 Flue temperature too high
b06 Low voltage
BLOCKING CODES
n01 Fan limited due to no flue sensor change
n02 Fan limited due to high outlet temperature
n03 Fan limited due to high Delta T
n04 Fan limited due to high flue temperature
n05 Fan increased due to low flame current
n06 Tank sensor is open
n07 Inlet sensor open
n08 Inlet sensor shorted
NOTIFICATION CODES
Description
C
0
C
o
C
o
Check wiring to sensor, make sure all is correctly connected and
undamaged
Check resistance of sensors with table
Check wiring to sensor, make sure all is correctly connected and
undamaged
None
The control will allow the burner to fire after 60 seconds or if the outlet
temperature drops 10 C
o
Verify the system is full of water and all air has been purged from the
system, pay particular attention to the EcoShield™ heat exchanger
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 for scale accumulation within the heat exchanger
Check supply
Check wiring connections at the low voltage terminal strip
Replace the transformer
Check 24v
Check the flue sensor is installed and positioned correctly
Check the sensor and wiring table 19.1, replace if required
Check sensor and wiring, replace if required
Check sensor and wiring, replace if required
Check resistance of sensors with table 19.1, replace sensor if required.
Check sensor and wiring, replace if required
Check resistance of sensors with table 19.1, replace sensor if required.
Blocking Codes
Notification Codes
Corrective Action
, replace sensor if required.
19.1
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