Servicing Tips and Instructions
3
Label all wires and wire connections prior to disconnecting when servicing any boiler controls. Wiring errors
can cause improper and dangerous operation. Always disconnect the power supply to the boiler before serv-
icing. Failure to comply could result in severe personal injury, death or substantial property damage.
Never bypass (jumper) any boiler, control or device except for momentary testing when troubleshooting the
boiler as outlined in this guide, severe personal injury, death or substantial property damage can result.
Initial Troubleshooting Checks
- Ensure all wire connectors to the control module and sensors are securely connected.
- Ensure the maximum gas supply pressure does not exceed 13”w.c. during flow or no flow conditions.
- Ensure the gas supply pressure is a minimum 5” w.c. during flow conditions (burner firing on all gas appliances).
Control Module Fuses
The control module contains 2 internal replaceable fuses. Ensure the fuses are in working condition prior to
replacing the control module or any boiler component. If one of the fuses has blown, it will prevent the con-
trol module and/or boiler components from operating properly.
To check or replace the control module fuses:
1. Disconnect the external power supply to the boiler.
2. Remove the front jacket panel of the boiler by removing the thumb screw along the top edge.
3. Remove the electrical connectors at the MCBA control module for the igniter, transformer and display (ribbon
cable) and the black plastic housing cover off the control module. Use care not to damage the cover when
removing it.
4. Remove both fuses and check for continuity to determine if fuse is blown, replace if necessary.
5. The control module is supplied from the factory with 2 spare fuses, a 5 amp fast acting fuse and a 4 amp slow
acting fuse, attached to the control module cover.
6. When replacing the fuses ensure the amp rating and type of the fuse matches the replacement fuse. Reference
Fig. 1, page 4 for amperage and location of the fuses.
Do not bypass any fuse with a jumper. Do not replace any fuse with a fuse that is not specified. Failure to
comply could result in severe personal injury, death or substantial property damage.
7. Re-install the control module cover, electrical connectors and the front jacket panel when completed.
WARNING
WARNING
WARNING
NOTICE
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