Cycling issues
Issue Diagnosis Fix
to improper piping.
Low water flow due
to undersized
pump.
Check manufacturer’s rating charts/check temperature differential
across heat exchanger.
Low water flow due
to restrictions in
water pipe.
Check temperature differential across zone/heat exchanger.
Low radiation. Check actual amount of radiation per zone and refer to
manufacturer’s rating tables.
Appliance over-
fired.
Clock gas meter/check gas pressure with manometer/ check CO
2
level.
Appliance
Oversized.
Check load calculation vs. minimum boiler output.
Improperly set or
defective controls.
Check operation with ohmmeter/voltmeter.
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