(5) When the relay is energized, it will supply 120 volt power for running the pump,
and activate the control board.
a) There should now be 120 volt AC power to the terminals labeled P2L and
P2N, as “STAT 2” has the jumper wire connected.
b) If there is no power, replace the relay.
c) Reconnect the jumper to the “STAT 1” terminals, there should now be 120
volt AC power to the terminals labeled P1L and P1N, as “STAT 1” has the
jumper wire connected.
(6) With the circuit board now activated, the power relays should turn on one at a
time. There is about a one to two minute delay before the first relay turns on,
and about the same for each additional relay. If they have not started to come on
as yet, temporarily turn up the temperature on the aquastat to the maximum
setting, it should be returned to the normal setting when you are finished
troubleshooting. The power relays for controlling the elements should now start
to turn on. It may take a minute or two for the first relay to turn on, and about
the same length of time for each subsequent relay to turn on. As each relay
turns on, one indicator light on the control board should come on as well.
a) If the element relay indicator lights do not come on, disconnect the
temperature sensor by pulling out the connector at the control board (the
one with the two gray wires).
b) If the indicator lights now come on, after waiting for the one to two minute
delay between each element the temperature sensor needs to be replaced. If
the indicator lights still do not come on the control board needs to be
replaced.
c) If the indicator lights come on, but the relays for the elements do not come
on then the low water cut off or the high limit control may be preventing
them from coming on. This may be due to a faulty component, or may be an
actual low water, or high temperature condition.
(7) If the boiler is equipped with the low water cut off option try the following only
when you are sure the boiler and the heating system are completely full of
water.
a) Unplug the low water cut off from the control board. Temporarily (no more
than one second) place a jumper wire across the two pins of the low water
cut off connector on the control board, the element relays should all
immediately turn on.
b) If the relays energize, replace the low water cut off, otherwise go on to the
next step.
(8) Temporarily (no more than one second) place a jumper wire across the two
terminals on the high limit control.
a) If the relays energize, replace the high limit control.
(9) If all the relays energize and there is no heat, then check for power to each of
the heating elements.
a) With all the relays energized, check that there is power to each of the
elements with a volt meter. If there is no voltage reading, replace the relay
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