Troubleshooting Flow Chart
Burner Will Not Fire
No or Insufficient
Domestic Hot Water
House Will Not Get or
Stay Warm
See Flow Chart, this page.
If installed with indirect water heater, insure end switch in relay box controlling indirect water
heater is properly connected to Cable 2. This will insure domestic water calls are prioritized. If
Cable 2 is not used, turn Economy Feature OFF.
1. Check for air-bound radiators.
2. Check thermostat settings including heat anticipator settings (common on non-digital
thermostats).
3. Check Economy setting. Economy feature, like outdoor reset controls, lowers average
boiler temperature and can slow or, in some cases, prevent the house from coming up to
temperature. Hove to lower setting.
Is Red
(_ LOW WATER
Control is
Sensing Low
Water
CAUTION- ALWAYS ALLOW BOILER TO COOL BEFORE
ADDING WATER
_3urner will not fire until low water condition is satisfied.
I_Verify system filled with water.
l_Verify sensor is inserted correctly into well.
Note: Use of heat-conductive grease may interferewith contact
between spring clip and copper well tube.
l, Verify control is tightly clamped to well.
Yellow LED
(HI TEMP)
Control is lIBurner will not fire until boiler water has dropped to high
Sensing High_/!_llimit differential set-point (10 ° below high limit setting).
Temperature
I II_Verifyhigh temperature settings correct.
Boiler
Yellow Reached
(TARGET) Target
Temperature
When ECONOMY function is active, control monitors
• Iheating demand and establishes Target boiler temperatures
_below high limit setting to conserve fuel. Burner will not
Ifire until boiler temperature drops to Target Temperature
IDifferential.
Boiler in Purge Mode
Is and will not fire until
PURGE LED temperature drops to
on? 140°F'
See Purge page 36.
Replace
Control
Both red and yellow LEDs are off and there is call
to fire burner, there will be 120 VAC in terminals
B1 and B2.
I_120 VACis not present, replace control.
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