A-5
TROUBLE: INSUFFICIENT HEAT
SOURCE PROCEDURE CAUSES REMEDY
Circulator
Check if circulator is opera- Coupling worn or broken. Replace coupling.
tional. Pump binding. Replace pump.
Circulator motor burned out. Replace circulator motor.
Wiring from operating Repair wiring.
control defective.
Operating control defective. Repair or replace operating
control.
Check if circulator is correct Circulator too small. Replace with proper circulator.
size.
Check if circulator is up to Circulator defective. Repair circulator.
speed; check if voltage to
circulator is sufficient. Insufficient voltage. Call utility company.
Thermostat
Check thermostat settings. Settings too low. Increase setting.
Check thermostat location. Bad location due to heat Move thermostat to a better
build up. location.
Check thermostat calibration. Out of calibration. Recalibrate.
Flow Valve
Check flow valve for sticking Flow valve not opening fully. Clean or replace flow valve.
in partially closed position.
Radiation
Check for air in radiators. Radiators airbound. Bleed radiators.
Check to see if radiators are Radiators inadequate. Install adequate radiation.
sized properly.
Boiler
Determine structure heat load. Boiler too small. Additional heating capacity
required.
Piping
Check to see if piping is sized Piping inadequate. Install adequate piping.
properly.
Tankless
Check usage of domestic Demand too large. Install flow regulator.
Coil
hot water. Additional boiler capacity
required.
Heat
Check heat exchanger for soot Insufficient heat transfer. Clean heat exchanger.
Exchanger
or scale accumulation.
Burner
Check pump pressure with Insufficient pump pressure. Increase pressure to 140 psi.
pressure gauge.
Nozzle
Check nozzle for size and Wrong nozzle installed. Install specified nozzle.
spray angle.
Check nozzle for plugged Nozzle underfiring due to Replace nozzle.
orifice, scored surface. defective nozzle.
