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TROUBLESHOOTING GUIDE
IMPORTANT NOTICE
These instructions are primarily intended for the use of qualified personnel specifically trained and experienced
in the installation of this type of heating equipment and related system components. Installation and service
personnel may be required by some states to be licensed. Persons not qualified shall not attempt to install this
equipment nor attempt repairs according to these instructions.
PROBLEM
1)When room thermostat is turned on,
boiler does not operate.
2)When room thermostat is calling for
heat, pump is on, but burners will not
turn on.
CAUSES
1)No power to the boiler.
2)Defective room thermostat or discon-
nected wire in thermostat circuit.
3)Defective transformer.
4)Defective pump relay.
5)Defective pump.
1)For standing pilot models pilot,
burner not lighted.
2)If pilot burner will not stay lighted,
thermocouple or gas valve may be
defective.
3)Gas knob in "Pilot" position.
4)For automatic ignition models,
gas valve knob is in "off" position.
5)Vent switch is open.
6)Roll-out switch is open.
7)High limit is open.
8) Fast Response Temperature
Sensor probe is defective.
9) Fast Response Temperature
sensor board is defective.
SOLUTIONS
1)Check circuit breakers, disconnect
switch. Make sure power is on.
2)Check continuity on thermostat and
wiring circuit. Replace thermostat, or
repair wiring connections.
3) Check secondary voltage. If no 24V,
replace transformer.
4) Check relay coil or contacts. Replace
as required.
5) Replace pump.
1)Light pilot burner. (Follow lighting
instructions on rating plate.)
2)Check thermocouple MV generation.
If less than 25MV (open circuit), re-
place thermocouple. If between 25-
35 MV, replace gas valve.
3)Turn knob to "ON" position.
4)Turn gas knob to "ON". If ignition
module locks out, reset by interrupt-
ing power to boiler.
5) Check for blockage of venting system
or disconnected vent piping. After
problem is corrected push button to
reset, or replace single-use type vent
switch.
6)Check for blockage of flue or sooted
heat exchanger. After problem is
corrected push button to reset or re-
place single use type roll-out switch.
7)Setting may be too low. Check water
flow and adjust setting to obtain 20-
30°F temperature rise.
8)Red LED on circuit board will be
ON
to indicate a loose sensor connection
or a shorted sensor. Check terminal
connectors or replace sensor as re-
quired.
NOTE: Red LED will also be ON if
sensor temperature exceeds 300°F or
drops below - 20°F. It will turn OFF
when sensor temperature returns to
the proper range. Yellow LED will be
ON if temperature exceeds 240°F. It will
turn off when sensor temperature falls
below 180°F. When either Red or Yel-
low LED is ON, boiler will be shut down.
9)Check voltage across output and
common terminals. If no 24V is pres-
ent, replace board.
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