Troubleshooting; No Operation - Alto-Shaam HSM-24/5S Service Manual

No Operation

Repair or replace the
No
wiring to the
contactor.
Repair or replace the
No
wiring to the ON/OFF
switch.
Repair or replace the
wiring from the ON/
No
OFF switch to
terminals A1 and A2 of
the contactor.
The contactor has
failed. Replace the No
contactor.
Repair or replace the
wiring from the
No
contactor to the
terminal blocks.
Heate d S h el f M er c han d is e r Se rvice Manu al
?
Measure the voltage at the
line side of the contactor.
Does the voltage
correspond to the voltage
printed on the serial
number tag?
Yes
Measure the voltage at the
ON/OFF switch.
Does the voltage
correspond to the voltage
printed on the serial
number tag?
Yes
Move the ON/OFF switch to
the ON position. Measure
the voltage at terminals A1
and A2 of the contactor.
Does the voltage
correspond to the voltage
printed on the serial
number tag?
Yes
Measure the voltage
between terminals at the
load side of the contactor.
Does the voltage
correspond to the voltage
printed on the serial
number tag?
Yes
Measure the voltage at L1
and L2/N terminal blocks.
Does the voltage
correspond to the voltage
printed on the serial
number tag?
MN -3 9054 Rev 1
? ?
Measure the voltage at the
outlet. Does the voltage
correspond to the voltage
printed on the serial
number tag?
Yes
Measure the voltage
between L1 and L2/N at the
main terminal block.
Does the voltage
correspond to the voltage
printed on the serial
number tag?
Yes
No
Is this a countertop
(3-shelf) unit?
Yes
Measure the voltage at the
ON/OFF switch.
Does the voltage
correspond to the voltage
printed on the serial
number tag?
Yes
Move the ON/OFF switch to
the ON position. Measure
the voltage at the load side
of the ON/OFF switch.
Does the voltage
correspond to the voltage
printed on the serial
number tag?
Yes
Move the ON/OFF switch to
the ON position. Measure
the voltage at L1 and L2/N
terminal blocks.
Does the voltage
correspond to the voltage
printed on the serial
number tag?
Yes
Repair or replace any
damaged wires, terminal
blocks, or jumper bars at L1
and L2/N terminal blocks.
4/17
?
T
ROUBLESHOOTING
Inform the customer to
No
call an electrician.
Repair or replace the
No
power cord.
Repair or replace the
No
wiring to the ON/OFF
switch.
Replace the ON/OFF
No
switch.
Repair or replace the
wiring from the ON/OFF
No
switch to L1 and L2/N
terminal blocks.
37