Troubleshooting Step By Step Procedure
The following is a step by step procedure to help in troubleshooting any problems with
this boiler. These steps should be preformed only by qualified personnel with
experience in hydronic heating systems, and electrical heating equipment. You are
working with high voltages and should be extremely careful.
Before energizing boiler, ensure system is full of water.
(1) Make sure that there is power to the boiler. There must be power to the boiler
to complete these troubleshooting steps.
a) On 240 volt single phase models there should be power at the main terminal
block. You should read 120 volts between L1 and N, 120 volts between L2
and N, and 240 volts between L1 and L2.
b) On three phase models there should be power at the main terminal block.
You should take three readings on the main terminal block, you should read
the appropriate voltage for your model between L1 and L2, between L2 and
L3, and between L1 and L3. You should also read 120 volts on the terminal
block on the lower right side on the terminals labeled S
L
and S
N
.
c) Disconnect the thermostat wires from the terminals “STAT 1” AND “STAT
2”. Measure the voltage at the top of the boiler at each heating element. If
you measure voltage at any of the elements, then the element relay for that
element is stuck on and needs to be replaced.
(2) Check the fuse on models equipped with a fuse.
a) Remove the fuse located inside the boiler. Check it for continuity. Replace
with a new fuse of the correct type if necessary.
b) Otherwise replace the existing fuse.
(3) Check that there is 24 volt AC power on the secondary side of the transformer.
These are the two wires running from the transformer to the control board.
There must be 24 volt AC power on the secondary side of the transformer for
the boiler to operate. If there is no power the transformer needs to be replaced.
(4) With the thermostat wires still disconnected from step (1)c), disconnect the
outdoor sensor as well, then connect a jumper wire from one terminal of STAT 1
to the other terminal of STAT 1.
a) This should energize the left hand Pump Relay to the right of the control
board, you should hear a click. If not check that there is 24 volt AC power on
the two terminals with purple wires going to this relay.
b) Remove the jumper wire from the “STAT 1” terminals, and jumper the
“STAT 2” terminals. This should energize the right hand Pump Relay. If not
check that there is 24 volt AC power on the two terminals with purple wires
going to this relay.
c) If there is no power at the relay, the control board needs to be replaced.
d) If there is power, but one of the relays is not turning on, replace that relay.
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