Weil-McLain SlimFit 2 Series Manual page 97

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SlimFit
COMMERCIAL CONDENSING GAS
Troubleshooting
Troubleshooting suggestions for SlimFit boilers
Display Condition
IGNITION Boiler went through 5 ignition
FAULT attempts and never detected
flame or flame sense value
never reached minimum
threshold for boiler model.
AIR PRESSURE Occurs when Air Pressure
Switch Open connection is open.
Part number 550-100-162/0815
-
FIRED WATER BOILER
(continued)
(continued)
Diagnostics
Automatically resets after 1 hour
or can be reset by performing
manual reset on boiler.
Reset using Manual Reset
screen on display.
High pressure in the exhaust
pipe or high vacuum in the
boiler intake or cabinet has
caused the air switch to open.
The switch is closed in normal
operating conditions.
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Boiler Manual Series 2
Corrective Action(s)
Check condensate trap for blockage allowing condensate to accumulate
inside heat exchanger.
Check ignition cable connection.
Fouled, worn, bent, or faulty igniter.
Fouled igniters can be cleaned for additional use with steel wool.
Worn or badly fouled igniters should be replaced with the proper repair
part.
Igniter rods should be parallel with a 3.5 mm (0.138 in) spark gap.
NOTICE: Thin white deposits on the igniter are typical, but brown or
black deposits could be the result of flue gas recirculation. Thoroughly
inspect the venting system and termination for the possibility of leakage
or flue gas feedback into the air line.
Dirty burner and/or heat exchanger will cause high back pressure and
poor ignition.
Follow procedure in maintenance section of this manual to clean burner
and heat exchanger. Visual inspection of flueways may not be sufficient
to diagnose condition.
Check combustion settings on high and low fire and adjust per setup
instructions if necessary.
Check incoming gas pressure with boiler off and at high fire. Adjust
within limits on rating label.
Verify correct boiler model and altitude is selected in control and correct
elevation must be entered when operating above 2,00 feet.
Check ignition cable resistance. Should measure 1000 Ohms (+/- 50
Ohms).
Check for flue pipe and intake pipe restrictions or blockage.
Check burner fasteners and gaskets.
Check venturi gaskets and proper venturi. (Propane models use different
venturi's).
Check boiler size selected in control against boiler rating label. Correct if
necessary to select the proper boiler size.
Check exhaust and intake pipe for restrictions or blockage.
Check condensate drain for blockage. If condensate is unable to drain
out of the boiler it can begin to block the flow of exhaust gases. Clean
the condensate collection area of the base and condensate trap. Refill
trap with fresh water.
Check the P7 connection as seen on Figures 50, page 54 &
Figure 51, page 56. Check the connections on the pressure switch.
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