Utica Boilers UB90-200 Installationsanweisungen

Burner Will Not Fire See Flow Chart, this page.

No or Insufficient 

Domestic Hot Water

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.

House Will Not Get or 

Stay Warm

Check for air-bound radiators.

Check thermostat settings including heat anticipator settings (common on non-digital 

thermostats). 

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. Move to lower setting.

Is Red LED 

(LOW WATER) 

On?

Is Yellow LED 

(HI TEMP) 

On?

Is Yellow LED 

(TARGET) 

On?

Is 

PURGE LED 

on?

Replace 

Control

Control is 

Sensing Low 

Water

Control is 

Sensing High 

Temperature

Boiler 

Reached 

Target 

Temperature

Boiler in Purge Mode 

and will not fire until 

temperature drops to 

140°F.  

See Purge page 36.

Both red and yellow LEDs are off and there is call 

to fire burner, there will be 120 VAC in terminals 

B1 and B2.
►120 VAC is not present, replace control.

Burner will not fire until low water condition is satisfied.
►Verify system filled with water.
►Verify sensor is inserted correctly into well.
    Note: Use of heat-conductive grease may interfere with contact          
              between spring clip and copper well tube.
►Verify control is tightly clamped to well.

Burner will not fire until boiler water has dropped to high 

limit differential set-point (10° below high limit setting).
►Verify high temperature setting is correct.

When ECONOMY function is active, control monitors 

heating demand and establishes Target boiler temperatures 

below high limit setting to conserve fuel. Burner will not 

fire until boiler temperature drops to Target Temperature 

Differential.