PROBLEM PROBABLE CAUSE
Coil Does Not Operate Steam valve failure a. Check steam valve. If air operated, check proper air
(Steam Coil) pressure. If electrically operated check for no power or
loose connection. If manual valve, check to see if
valve is open. If necessary repair or replace valve.
b. Defective thermostat or wrong setting
Steam trap failure Condensate backs up into coil. Check steam trap,
(Steam Coil) repair or replace
Diverter valve a. Check power to valve as above
(Hot Water Coil)
b. Diverter valve piped wrong
Coil Does Not Deliver No steam or hot water Check boiler for proper steam pressure or hot water
Adequate Heat temperature setting.
Thermostat a. Thermostat improperly located, relocate.
b. Thermostat defective, replace
c. Improper set point, reset
d. Defective controls, see above
Coil undersized Replace with larger coil
Insufficient steam pressure Check boiler controls
Lack of hot water Hot water pump undersized or malfunctioning
Dirty finned tubes Vacuum or use air hose to gently clean dirt from
finned tubes
Coil Leaks Crack in brazed connection Repair brazed joint
Internal corrosion Replace coil
SOLUTION
TROUBLE SHOOTING GUIDES
HEATING COILS
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