Sterling TF-125 Benutzerhandbuch

20

  1. Burner orifi ce too small.

 1. 

Irregular orifi ce causing whistle or resonance.

  2. Excessive gas input.

  1. Clogged main burners.
 2. 

Misaligned 

orifi 

ces.

  3. Insuffi cient combustion air.
  4. Possibly over fi red.

 1. 

Blocked 

venting.

  2. Insuffi cient combustion air.
  3. Blocked heat exchanger.
  4. Air leak into combustion chamber 

or draft hood.

 1. 

  2. Leaking gas test port on valve.
  3. Blocked heat exchanger.
  4. Blocked draft hood.
  5. Negative pressure in the building.

 1. 

Improper 

ground.

  2. Bad or broken spark cable.
 3. 

Faulty 

control.

  4. Pressure regulator set too low.

  5. Main burner orifi ces dirty.
 6. 

Improper 

venting.

  1. Gas supply is off.
  2. No power supply to unit.

  3. Thermostat not calling.

  4. Defective high limit.

  5. Defective drafter prove switch.

 6. 

Loose 

wiring.

 7. 

Improper 

ground.

  8. Improper thermostat or transformer wiring.
 

 

 1. 

Improper 

venting. 

  2. Unit under fi red.

  3. Building too cold.

 1. 

Check with local gas supplier for proper orifi ce 
size and replace. Refer to “Operation”.

 1. 

Replace 

orifi 

ce. 

  2. Test and reset manifold pressure.

  1. Clean main burner ports.
  2. Replace manifold assembly.
  3. Insuffi cient combustion air.
  4. Check gas input and manifold pressures.

  1. Clean Flue. Refer to “Installation”.
  2. Clean combustion air inlet openings.
  3. Clean heat exchanger. Refer to “Installation”. 
  4. Determine cause and repair accordingly.

  1. Inspect all gas piping and repair.
  2. Check to ensure gas test ports are seated.
  3. Clean heat exchanger/fl ue.
  4. Clean fl ue collector. 
 5. 

See 

“Installation”.

  1. Check grounding wires and spark bracket 

connections.

  2. Inspect spark cable connections and cuts.
  3. Check to ensure spark is energized after 

pre purge period.

  4. Test and reset manifold pressure refer to 

“Operations”.

  5. Clean or replace orifi ces.
 6. 

Refer 

to 

“Installation”.

  1. Open all manual valves “check for leaks”.
  2. Turn on power supply, check fuses and 

replace if bad.

  3. Turn up thermostat, Check for 24v on 

terminals R and W1 on terminal strip.

  4. Check switch for continuity if open with no 

heat present, replace.

  5. Check switch operation to ensure 

switch closes after draftor purge period. 
If it does not make/check tubing 
connections/ blockage.

  6. Check all wiring per diagram.
  7. Check all ground wires and connections.
  8. Check both, for wiring according to diagram;
 

 check for 24V at gas valve terminals during 

trial for ignition period if present and valve 
does not open. Replace valve.

 1. 

Refer 

to 

“Installation, 

Venting”.

  2. Check gas supply pressures to unit. Refer 

to “Installation”.

 3. 

Refer 

to 

“Installation”.

  A. Flame pops back.

 B. 

Noisy 

Flame.

  C. Yellow tip fl ame (some yellow 

tipping on LP gas is permissible).

 D. 

Floating 

fl 

ame.

 
 E. 

Gas 

odor.

 F. 

Delayed 

ignition.

  G. Failure to ignite.

 H. 

Condensation.