8.3.2 Temperature issues
Temperature issues
Issue Diagnosis Fix
Low heat Operating temperature
too low. Increase
temperature target.
Increase temperature target.
Priority parameters or
load configuration
improperly set up.
Review load configuration parameters.
appliance undersized. Refer to Load Calculation vs. Boiler Output.
Air trapped within
system.
Bleed system as required.
Improper system
piping.
Refer to recommended piping guidelines for the
respective boiler model.
System pump
undersized.
Check pump manufacturer’s data/check temp differential
across heat exchanger.
Poor gas:air mixing. Check CO
2
level.
Defective thermostat. Refer to manufacturer’s instructions.
Obstruction in
condensate drain.
Inspect and clean condensate drain.
appliance cycling on
operating/ safety
controls.
Check operation with Ohmmeter/Voltmeter.
System radiation
undersized.
Check manufacturer’s rating tables for capacity per foot.
Temperature
exceeds
thermostat
setting
Incorrect anticipator
setting.
Check with Ammeter.
Thermostat not level. Check level.
One or more
zones do not
heat properly
Air trapped within zone
(s) piping
Vent system/zone as required.
Low radiation/
excessive heat loss.
Check actual length of pipe using radiation / heat loss
calculation.
Low flow rate to zone
(s).
Check temperature drop across zone.
Defective zone valve/
zone circulator.
Check operation per manufacturer’s instructions.
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