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Push reset button on Flue Temp Limit
(Fig 14.4)
Reset Boiler
Does Boiler
Start?
Reset Boiler
Push reset button on Supply Temp
Limit (Fig 14.4)
Does Boiler
Start?
Flue Temp Limit was open and
will probably open again. Look
for:
* Fouled flue passages
* Manifold pressure too high
* Incorrect Burner Orifice
Supply Temp Limit was open and will probably
open again. Look for:
* A problem with the supply sensor
* Water-side blockage in one of the boiler heat
exchangers or internal boiler piping
A
ir switch stuck in closed position:
* Condensate in pressure switch tubing
* Kinked pressure switch tubing
* Defective air pressure switch
* Defective Inducer
Does Inducer
(Fan) start before
error code
reappears?
Is 120VAC present
across Inducer?
Reset Boiler
A
ir pressure switch is not proving airflow:
* Blockage in Vent or Intake
* Vent system too long or undersized (see Vent Section)
* Condensate in pressure switch tubing
* Leaking or kinked pressure switch tubing
* Blockage in primary or secondary heat exchanger
* Fouled Inducer Venturi
* Defective air pressure switch
N
Y
N
N
N
Y
Y
Y
Figure 15.4 Flow Chart for Isolating Limit and APS Errors (See Table 15.3)