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2. Note the error code, either through the flash code
on the PIM and/or from the Toolbox menu on the
user interface, and reference the explanation of
the fault along with troubleshooting steps in the
XTherm fault text section.
3. Press and release the RESET key to clear the
fault on the user interface and resume operation.
Be sure to observe the operation of the unit for a
period of time to ensure correct operation and no
reoccurrence of fault code(s).
XTherm Fault Text
Error Display
If there is an active error, then it is displayed as the first item in the Toolbox Menu and it is the default display
for the control until the error is resolved.
Table Z: Error Display
Error Item Description and Troubleshooting
OUTLET SEN Check the outlet water sensor and its wiring.
LIMIT SEN Check the high limit sensor and its wiring.
INLET SEN Check the inlet sensor and its wiring.
GAS PRESS Check PIM wiring.
IGNITION Reset control, push and release RESET button
LIMIT TRIP Boiler temperature tripped the high limit.
FLAME False flame detected. Shut off gas supply, recycle power.
ID CARD Identity card, check ID card and wiring.
IGN CTRL Internal control fault. Reset power, replace control.
DELTA T
Temperature difference between the inlet and outlet exceeded the set
point. Check water flow.
LOW 24VAC Low 24 VAC power. Check power supply wiring and transformer.
BLOW SPEED Blower speed out of range. Check blower wiring and blower.
WARNING: Do not use this appliance if any part has
been under water. Improper or dangerous operation
may result. Contact a qualified service technician to
inspect the boiler and to repair or replace any part of
the boiler that has been under water prior to placing
the boiler back in operation.
WARNING: When servicing or replacing any
components of this unit be certain that:
• The gas is off.
• All electrical power is disconnected.
DANGER: When servicing or replacing components
that are in direct contact with the water, be certain
that:
• There is no pressure in the boiler. (Pull the release
on the relief valve. Do not depend on the pressure
gauge reading).
• The boiler water is not hot.
• The electrical power is off.
CAUTION: If overheating occurs or the gas supply
fails to shut off, do not turn off electrical power to the
circulating pump. This may aggravate the problem
and increase the likelihood of boiler damage.
Instead, shut off the gas supply to the boiler at the
gas service valve.
CAUTION: Wiring errors can cause improper and
dangerous operation. Verify proper operation after
servicing. See wiring diagram.
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