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
