103
TRX Series II - Installation - Startup - Maintenance Instructions
B. Boiler Error Codes
CH Circuit
1 01*
101
Outlet temperature
exceeded 210F
Reset the error by tapping the reset button
Blocking
(Manual
Reset)
Air in the system
Ensure boiler is free of air and pressurized to at least
20PSI
Return filter plugged Ensure return filter in the boiler (if equipped) is clear
Failed internal circulator/
internal circulator not
powered
Verify that the internal pump is operating properly
(blue light on solid). Verify the pump has 120VAC
when the heating or hot water call is active
Plugged plate heat
exchanger(combi only)/
indirect hot water tank
If problem occurs during hot water demands only,
check the plate exchanger, combi boilers, or indirect
hot water tank and plumbing for blockages.
Improper piping or boiler
commissioning
If not using the DHW connection ensure the diverting
valve is moving freely and is locked in the heating
position (upper position). See diverting valve stuck
ensure the piping matches the instructions in the
installation manual for that specific model.
Damaged/ Malfunctioning
temperature sensor
Swap the inlet and outlet sensors and verify that the
sensors read correctly in both positions. If the sensors
differ by more than 5F, replace the sensors, check for
water damage or corrosion on sensors. Compare the
resistance of the sensor to the temperature resistance
chart.
Safety circuit interrupted
Check the loop of black wire, connector 26, on PCB
(cn26). If a LWCO or other safety device is wired into
the jumper, check the device for proper operation.
Reseat the electrical connector and reset the error.
1 03*
103
Supply temperature rising
faster than 12.6 degrees per
second three times in a row.
Reset the error by tapping the reset button
Blocking
(Manual
Reset)
Air in the system
Ensure boiler is free of air and pressurized to at least
20PSI
Failed internal circulator/
internal circulator not
powered
If the problem occurs during heating and hot
water demands, ensure return filter in the boiler (if
equipped) is clear, and the internal pump is operating
properly (blue light on solid). Verify the pump has
120VAC with the heating or hot water call is active.
Plugged plate heat
exchanger(combi only)/
indirect hot water tank
If problem occurs during hot water demands only,
check the plate exchanger (combi boilers only) or
indirect hot water tank and plumbing for a blockage.
Improper piping or boiler
commissioning
If not using the DHW connection ensure the diverting
valve is moving freely and is locked in the heating
position (upper position) See diverting valve stuck,
ensure the piping matches the instructions in the
installation manual for that specific model.
Damaged/ Malfunctioning
temperature sensor
Swap the inlet and outlet sensors and verify that the
sensors read correctly in both positions. If the sensors
differ by more than 5F, replace the sensors, check for
water damage or corrosion on sensors. Compare the
resistance of the sensor to the temperature resistance
chart.
Part 13 - Troubleshooting
Display Error code Error Description
Possible cause
Possible Remedies
Error
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