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XII. Troubleshooting
Electrical Shock Hazard. Turn off power to boiler before working on wiring.
A. Troubleshooting problems where no error code is displayed.
Condition
Boiler not responding to call for heat, "Status" and
"Priority" show "Standby".
Boiler not responding to a call for heat, "Status"
shows "Standby" and "Priority" shows Central Heat
or Domestic Hot Water.
Boiler Running but System or Boiler Circulator is
not running
Home is cold during mild weather days
Home is cold during cold weather days
B. Display Faults:
Faults are investigated by selecting the "Help" button from the "Home" screen. When a fault is active the "Help" button flashes
and the home screen turns a red color. Continue to select flashing buttons to be directed to the Fault cause.
Indication
Display Completely Dark
Fan off, LWCO lights off, no green power
light on Control
Display Completely Dark, Fan running
Blinking Green power light on Control
Display Completely Dark but Boiler fires
**00FF or **ERFF
ER0011
ER0012
WARNING
Boiler is not seeing call for heat. Check thermostat or zone wiring for loose connection,
miswiring, or defective thermostat/zone control.
Boiler is not firing, temperature is greater than setpoint. Water flow through boiler primary
loop non-existent or too low.
•
Check wiring for loose connection, miswiring.
•
When there is a Domestic Hot Water Heat Request the System or Boiler pumps will be
forced "off" when there "Run Pump for" parameter is set to "Central heat, off DHW
demand" or "Central Heat, Optional Priority". This has been set to allow all of the heat
to be provided for fast indirect water heater recovery. After one hour of "priority
protection" or the end of the Domestic Hot Water Heat Request the system and boiler
pumps will be free to run.
•
Increase Low Boiler Water Temperature parameter 5°F (2.8°C) per day.
•
Increase High Boiler Water Temperature parameter 5°F (2.8°C) per day
Figure 48: Help Menu
Condition
No 120Vac Power
Check breaker and wiring between breaker panel and boiler.
at Boiler
No 24Vac
- Loose 120Vac connection wiring between boiler J-Box and transformer
Power to Control
- Loose 24 Vac connection wiring between transformer and Control.
Control
- The green light is connected to internal power supply. The power supply
Fault
is repeatedly starting and stopping (not normal) making the light flash. The
microprocessors are not running.
- Try disconnecting all terminals except 24VAC to power the Control. The
green light should be steady. If it is not, then the control is defective. If
steady, start plugging in all the connectors while watching the green light.
When faulty wiring reconnected, green light will begin to flash.
No 5 Vdc
- Loose 5 Vdc connection wiring between display and Control
Power to Display
- Defective Display or Control.
display lost
- Loose or defective display harness
communication
- Defective Display
with control
- Defective Control
Adjustment Mode
- The Control and Display are NOT defective. The password has timed out.
Password Timeout
Simply cycle power to the Display to restore operation.
Control Failed
Defective Control. Replace R7910.
104
Possible Cause
Possible Cause
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