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XII Troubleshooting
The following three pages contain troubleshooting charts for use in diagnosing control problems. To use these charts, go
to the box marked “Start” at the top of the next page and follow the appropriate path though the chart until a box with a
list of possible causes is reached. If the problem is known to be within the ignition system, go directly to the Intermittent
Ignition Troubleshooting guide on page 46. In using these charts, the following should be kept in mind:
1) These charts are only meant to be used by a professional heating technician as an aid in diagnosing control problems.
2) Where applicable, follow all precautions outlined in the lighting instructions on page 37.
3) In general, these charts assume that there are no loose or miswired electrical connections. Before using these charts,
inspect all electrical connections on the boiler to make sure that they are tight. Also, check the wiring on the boiler against
the wiring diagram in Figure 36.
4) The possible causes at the end of each branch in these charts are not
listed in order of likelihood. All controls on the
BWF are tested at least once in the manufacturing process and a defective control or component is generally the least
likely cause. Before replacing a component, try to rule out all other possible causes.
5) If the charts indicate that the transformer in the R8285 is defective, it is possible that this transformer has been
destroyed by a short circuit in the boiler wiring. Before replacing the R8285, carefully inspect all low voltage wiring on
the boiler for places where it is touching the frame of the boiler or wiring on the other side of the transformer.
6) If the charts indicate that the relay on the R8285 or the R8222 relay is defective, inspect the coil of the relay for visible
heat damage. If such damage is found, there is a good chance that a second transformer is present in the thermostat or
zone valve circuit, resulting in the application of 48 volts across the relay coil. In older buildings, this transformer may be
hidden in a location far from the boiler. If this second transformer exists, it must be found and removed before the relay is
replaced.