Slant/Fin 3000-190 - Manual (Page 7)

Yes ̈ Recheck Wiring
Is the
Limit Circuit
Closed?
YES
Does the
Control Have
Power?
NO
7
NO
NO
Is the
Red LED
(LOW WATER)
On?
The Control is
Sensing
Low Water.
CAUTION – ALWAYS ALLOW A BOILER TO COOL BEFORE ADDING WATER
The burner will not fire until the low water condition is satisfied.
̈ Check that the system is filled with water.
̈ Check that the sensor is inserted correctly into well.
Note: The use of heat-conductive grease may interfere with the
contact between the spring clip and the copper well tube.
̈ Check that the control is tightly clamped to the well.
Is the
Yellow LED
(HI TEMP)
On?
The Control is
Sensing High
Temperature.
If both the red and yellow LEDs are off and
there is a call to fire the burner, the Limit
Contacts should be closed.
Replace
Control
The burner will not fire until the boiler water has dropped to the
high limit differential set-point (10° below high limit setting).
̈ Check that the high temperature setting is correct.
Troubleshooting Flow Chart – Burner Will Not Fire
YES
YES
NO
Is the
Yellow LED
(TARGET)
On?
The Boiler has
Reached the
Target
Temperature.
When the ECONOMY function is active, the control monitors heating
demand and establishes Target boiler temperatures below the high
limit setting to conserve fuel (see “How Thermal Targeting Works”
on page 5). The burner will not fire until the boiler temperature
drops to the Target Temp Differential (see “Differentials” on page 5).
YES
Is the
PURGE
LED On?
The Control is
Purging Latent
Heat from the
Boiler.
The Thermal Pre-Purge feature holds off the burner until the
circulator has purged the boiler temperature down to 135°F.
See Purge on page 5.
YES
NO
NO
̈ Recheck Wiring