Utica Boilers UB90-200 Installationsanweisungen

Before Troubleshooting:

A.  Verify circuit breaker is on or fuse is OK at electrical 

panel.

B.  Verify service switch is ON.
C.  Verify Gas is ON at:

•  Gas meter 
•  Appropriate manual shutoff valves
•  Gas control valve

D.  Verify thermostat is calling for heat.
E.  Verify wire connections at integrated boiler control 

(IBC) and originating control are securely plugged 

in or connected. 

F.  Check hoses are securely connected and are not 

plugged or damaged.

Troubleshooting Tools:

A.  Voltmeter to verify 120 VAC and 24 VAC
B.  Continuity Tester
C.  Inclined Manometer or Pressure Gauge with 0-2.0” 

range (0.01” scale) for measuring suction pressures 

at pressure switch. 

D.  U-Tube Manometer or Differential Pressure Gauge 

with 0-14” range (0.1” scale) for measuring inlet 

and manifold gas pressures.

System Status:

A.  Consult “System Status” on page 40.
B.  See Figure 19, Page 26, for location of boiler 

Diagnostic Indicator Lamps.

Fire, explosion or shock hazard may cause death or 

serious injury. Do not attempt to modify physical or 

electrical characteristics of this boiler in any way.

  

•  In reset from lockout condition, all electrical meter 

readings at gas control valve (24 vac) must be taken 

within trial for ignition period. 

•  If any component dose not function properly, make 

sure it is correctly installed and wired before replacing.

•  Static electricity discharge can damage integrated 

boiler control (IBC).  Touch metal surface to discharge 

static electricity before touching IBC.

•  IBC cannot be repaired.  If it malfunctions it must be 

replaced.

•  Only trained, experienced  service  technicians should 

service IBC systems. Follow troubleshooting to check 

out system and sequence of operation for normal light 

off sequence.

•  Defective control is least likely cause of malfunction. 

If you suspect unit has defective control, read through 

troubleshooting chart before replacing it. 

•  It is unlikely two consecutive controls are defective. If 

this seems to be the case chances are the controls are 

not the cause but rather malfunction is due to some 

other problem such as electrical short burning out 

transformer.