67Table 15.3: Error Codes
Lamp Number
1 2 3
Flame
L.O.
Lamp Meaning Corrective Action
Differential Water Pressure
Switch Failed to Clos e After
180s
Reset the boiler by turning the Heating System Knob to “0”
for a few secon ds, then return ing it to its or iginal positi on.
Then:
• Verify that that boil er and system are purged of air
• Verify that there is at least 4.5psi at the boiler
gauge
• Verify that cirulator is running
• Close the throttling valve on th e supply more or
install flow restrictor in supply (see piping section)
Failure to Es t ablish Flame
or
Blocked Condensate Trap
or
Reversed Line Voltage
Polarity
(Note: LED #2 will not
illuminate until error has
been present for 4 minutes)
Reset the boiler by turning the Heating System Knob to “0”
for a few secon ds then return ing it to its or iginal positio n.
Push Flame Rese t Button. The n verify that:
• Gas line is purged of air (new installations)
• Inlet gas and manifold pressures are correct (see
Start-up Section)
• Manifold pressure is correct (see Start-up section)
• Electrodes have a gap of 0.149” – 0.157”
• Electrodes, flame rod, and wiring are in good
condition
• Condensate trap is draining c orrectly
• 120VAC exists between the hot (brown)
connection and ground and not between the
neutral (blue) and ground.
Air Pressure Switch Problem
or
Supply Limit Open
or
Flue Gas Limit Open
(Note: LED #2 will not
illuminate until error has
been present for 4 minutes)
Use the flow chart in this section to diagnose the exact
problem.
Defective Supply Sensor Replace Supply Sensor
Defective DHW Sensor Replace DHW Sensor
Excessive Temperature on
Primary Circuit Consult Factory
Consult Factory
Consult Factory
Lamp OFF La m p O N Flashing lamp, alone
or simultaneously
with another lamp.
Flashing lamp,
alternate with
another lamp