Hard Lockout Codes Displayed - Burnham CHG CHG225 Installation & Operation Manual

C. Trouble shooting problems where a hard lockout code is displayed. When a hard lockout occurs, the boiler
will shut down and the display will flash the letter "E" followed by a two digit service code. Once the condition
that caused the lockout is corrected, the boiler will need to be manually reset using the RESET button on the
display.
Table 13.4: Hard Lockout Codes Displayed
CODE CONDITION
A flame signal was present when there should
E 00
be no flame.
E 02 Flame failure after 5 tries to restart
E 03 Gas valve error
E 04 Power failure occurred after lockout
E 05
E 06
Internal control failure
E 07
E 11
E 12 Low water cut-off circuit open
E 13
E 14
E 15 Internal control failure
E 16
E 17
MCBA supply sensor detected temperatures in
E 18
excess of 200°F for an extended period of time
MCBA return sensor detected temperatures in
E 19
excess of 200°F for an extended period of time
Blower is not running when it should or fan
E 28
speed signal not being detected by MCBA
E 29 Blower fan speed has not returned to zero rpm
E 31 Shorted supply temperature sensor
E 32 Shorted return temperature sensor
E 35 Flue gas temperature sensor short circuit
E 36 Supply water temperature sensor circuit open
E 37 Return water temperature sensor circuit open
E 40 Flue gas temperature sensor circuit open
E 44 Internal control failure
E 52 Flue gas temperature over 230°F
E 60 Internal control failure
POSSIBLE CAUSES
• Defective gas valve - make sure inlet pressure is below maximum
on rating plate before replacing valve.
• No gas pressure
• Gas pressure under minimum value shown on rating plate
• Gas line not completely purged of air
• Defective Electrode
• Loose burner ground connection
• Defective Ignition Cable
• Loose or defective gas valve harness
• Defective gas valve (check for 24 VDC at harness during trial for
ignition before replacing valve)
• Air-fuel mixture out of adjustment - consult factory
• Loose or defective gas valve harness. Check electrical
connections.
• Defective gas valve (check for 24 VDC at harness during trial for
ignition before replacing valve)
• Some other error on this list occurred and power to the boiler was
then interrupted. Reset control and see if hard lockout reoccurs.
• Reset the control. If problem reoccurs, replace the MCBA.
• If yellow light on LWCO is on, system is low on water
• If neither yellow nor green light is on, check LWCO harness and
check for 24VAC across AT140 transformer
• Reset the control. If problem reoccurs, replace the MCBA.
• See possible causes for "b18" error. Also, check safety limit for
proper operation.
• See possible causes for "b19" error.
• Loose connection in 120 VAC fan wiring
• Loose or miswired fan speed harness
• Defective fan
• Miswired fan speed harness
• Defective fan
• Shorted or miswired supply sensor wiring
• Defective supply sensor
• Shorted or miswired return sensor wiring
• Defective return sensor
• Shorted or miswired flue temp sensor wiring
• Defective flue temp sensor
• Loose or miswired supply sensor wiring
• Defective supply sensor
• Loose or miswired return sensor wiring
• Defective return sensor
• Loose or miswired flue temp sensor wiring
• Defective flue temp sensor
• Reset the control. If problem reoccurs, replace the MCBA.
• Heat exchanger needs to be cleaned
• Boiler over-fired
• Air-fuel mixture out of adjustment - consult factory
• Reset the control. If problem reoccurs, replace the MCBA.
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