8.4.2 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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