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Bobcat Models B-120A and B-200A
42
GENERAL TROUBLESHOOTING GUIDE FOR SERVICE PERSONNEL
WARNING: Only a trained, experienced service technician should perform troubleshooting.
Turn off all electrical power to the boiler before servicing.
A. BURNER FAILS TO OPERATE - NO HEAT
CA
USE REMEDY
1. No power, display off, power switch off. Main electric 1. Close switch. Check or replace fuse.
switch open. Blown or defective line fuse.
2. Gas supply valve shut off. 2. Open gas supply valve. Check gas pressure.
3. Harnesses plug-in connectors are not securely connected. 3. Check connectors on boiler control.
4. Operational problem, detected by control. 4. Error code on display can be correlated to
specific problems and remedy. Refer to page
37-39 for error codes.
B. NOT ENOUGH HEAT
1. Thermostat setting is too low. 1. Set thermostat at higher setting.
2. Boiler water maintained at too low temperature. 2. Increase space heating set point temperature.
Refer to Table 4 on page 31.
3. Circulator not running. 3. With thermostat calling for heat, check for power
to circulator. If power is O.K. but circulator is not
running, replace circulator.
4. Boiler water level too low. 4. Carefully snap open relief valve handle to
determine if boiler is full of water, if not full of
w
ater
, check for system leaks and check water
pressure regulator. Repair any system leaks.
Adjust or replace water pressure reducing valve.
5. Fuel input rate too low. 5. Check the maximum fuel input firing rate.
Refer to page 36 for the procedure.
C. FUMES AND GAS ODORS
1. Leaks in gas piping or accessories. 1. Locate leaks and repair.
2. Gas leaks in service line or meter connections. 2. Close service supply valve - shut down boiler
and notify utility.
3. Condensation trap is not full of water. 3. Check and fill with water
4. Venting system is physically damaged. 4. Check carefully and repair. Also, see “Venting
System Regular Inspection”.
5. Over - firing or poor combustion. 5. Check the maximum fuel input firing rate and
combustion. Refer to page 36 for procedure.