14
OM-NGB/3
Troubleshooting
Do not operate the unit if it malfunctions or has damaged or broken parts. NGB/3 and NGB/3/E steam boilers are designed to operate
smoothly and efficiently when maintained properly. However, the following is a list of checks to make if there is a problem. Electrical
schematics are provided in this manual, and inside the unit electrical enclosure. IF THE ITEM ON THE LIST IS MARKED WITH (X), THE
WORK SHOULD ONLY BE DONE BY A FACTORY-AUTHORIZED SERVICE REPRESENTATIVE.
SYMPTOM
WHO
WHAT TO CHECK
Boiler does not fill with water.
User
a. Is water supply connected and is water present?
b. Is water pressure low (less than 30 PSI)?
c. Is strainer screen (if used) clogged?
d. Is on/off switch in base cabinet turned on? Is the amber light in
the on/off switch “ON”?
e. Is the manual drain valve open?
Authorized
Service Rep Only
f. Is the Water Level Control Board defective? Check for loose
electrical connections on water fill solenoid. (X)
g. Is the water fill solenoid valve defective? (X)
h. Is the solenoid drain valve open or leaking? Check for loose
electrical connections on solenoid drain valve. (X)
Boiler overfills with water.
User
a. Is the boiler level? Check levelness of unit with a spirit level.
b. Is the water pressure too high? (Greater than 60 PSI?)
Authorized
Service Rep Only
c. Is the Water Level Control Board defective? Check for loose
electrical connections on “hi” water fill solenoid. (X)
d. Is the water fill solenoid valve defective? (X) Check for debris on
valve seat.
e. Is the “hi” water probe sensing level? Clean water level probe
and probe well (located in boiler). (X)
Boiler under fills with water.
User
a. Is the boiler level? Check levelness of unit with a spirit level.
Water enters boiler slowly.
User
a. Is strainer screen (if used) clogged?
b. Is the water pressure too low? (Less than 30 PSI)?
c. Is the water supply line too small?
Authorized
Service Rep Only
d. Is the water fill solenoid defective? (X)
RESET light does not come
on.
Authorized
Service Rep Only
a. Is the Is the Water Level Control Board defective? Check for
loose electrical connections on “mid” water fill solenoid. (X)
b. Is the “mid” water probe sensing level? Clean water level probe
and probe well (located in boiler). (X)
c. Is the indicator light defective? (X)
Pilot burner will not light
(spark ignition).
User
a. Is supply gas valve open?
b. Is gas valve knob in the “ON” position?
c. Is the boiler filled with water? Is the green light in the start switch
“ON”?
Authorized
Service Rep Only
d. Does the pilot flame require adjustment? Screw attachment on
gas valve. (X)
e. Is the gas valve defective? (X)
Pilot burner will not stay lit.
Authorized
Service Rep Only
a. Does the pilot flame require adjustment? Screw attachment on
gas valve. (X)
