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Quantum Control Troubleshooting
56. Unit Will Not Heat – Steam
Note: Tests are conducted with unit running
and calling for heat.
All voltage checks are referenced to
transformer neutral.
Correct wiring
between H5-13 and
N.O. of airflow
switch.
Is there voltage at
H5-13 of control?
Is there voltage
at H5-1 of
control?
Correct wiring
between input
terminal and H5-1.
Is there voltage at input
terminal of the motor
control relay?
Replace relay.
Is there
voltage at the
output terminal of the fan
motor relay?
Check wiring
between motor
terminal 3 and
motor relay.
Is there voltage at
terminal 3 of the fan
motor?
Check motor
or replace if
necessary.
Is there voltage at
terminal 5 of fan motor
relay?
Check cabinet
limit for proper
operation. Replace
if necessary.
Is there voltage to the
output of the cabinet
limit?
Check steam
valve for proper
operation. Replace
if necessary.
Verify that the correct
steam is supplied to the
unit. Verify that the steam
valve and other items were
installed according to the
Installation Manual.
Does the
steam valve
open?
No
Yes
Is the
thermistor
operational?
Replace
control.
Replace
thermistor.
Yes
No
No
Yes
No
Yes
Yes
No
No
Yes
Yes
No
No
Yes
Yes
Yes
No
(1)
(2)
(3)
(4)
(5)
(6)
(8)
(9)
TMB2276S
Correct wiring
between cabinet
limit and terminal 5
of fan motor.
Is there voltage to the
input of the cabinet
limit?
No
(7)
Содержание YT025E
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