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8.3. Heater Faults
1. When a fault condition occurs, the controller will
flash a red light on the PIM and display the error code
on the user interface. The alarm output will also be
activated. Most fault conditions will also cause the
heater pump to run in an attempt to cool the unit.
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. Investigate and correct the cause of the fault.
4. 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).
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WARNING:
When servicing or replacing any
components of this unit be certain that:
•
The gas is off.
• All electrical power is disconnected.
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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 heater and to repair or replace any part of the heater
that has been under water prior to placing the heater back
in operation.
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DANGER:
When servicing or replacing components
that are in direct contact with the water, be certain that:
•
There is no pressure in the heater. (Pull the release on
the relief valve. Do not depend on the pressure gauge
reading).
• The heater water is not hot.
•
The electrical power is off.
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CAUTION:
Wiring errors can cause improper and
dangerous operation. Verify proper operation after
servicing. See wiring diagram.
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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 heater damage. Instead, shut
off the gas supply to the heater at the gas service valve.
8.4.
XTherm Fault Text
8.4.1. 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.
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
Heater 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
FLOW ERROR
The unit is not detecting enough flow to allow ignition sequence to take place
UNDER FLOW
The flow reading has drop under minimum requirements to keep the current operation point
FLOW WARNING
Operation conditions do not match current flow reading
Table AA. Error Display
