TROUBLESHOOTING AND REPAIR INSTRUCTIONS FOR L&L KILNS
troubleshoot-general.pdf
REV: 4/15/2017
Page 4
2017
L&L Kiln Mfg, Inc. 505 Sharptown Rd, Swedesboro NJ 08085 856.294.0077 F:856.294.0070 [email protected] hotkilns.com
On/Off Switch
The on/off switch rarely needs replacing but if you have to
replace that see this video:
hotkilns.com/ replace-on-off-
switch
Plug & Cord (if you have one)
1) Make sure the power cord is plugged into the receptacle.
Reseat plug. Make sure it is held firmly and that the springs
inside the receptacle seem to be working.
2) With power off examine the electrical cord. Look for
burned or melted areas and breaks or pinched sections.
Look closely at the head of the plug. If there is an internal
problem with the wires and the plug parts you won’t be able
to see it but you may detect a softening or melting of the
plastic at the plug head. Look for oxidation or substantial
discoloration or even burnt spots on the prongs. Replace
plug and cord if this is questionable.
3) With power turned on and panel open check voltage at
the Power Terminal Block. If you see no voltage there then
you know something is wrong with the power source.
CAUTION: This test should only be done by an experienced
person familiar with electricity and its dangers.
If you have to replace the power cord see this video. It
includes video of changing a power cord.
hotkilns.com/
change-phase-easy-fire
Checking voltage at the power terminal block.
Circuit Breaker / Power Source
1) Check voltage at the receptacle. CAUTION: This test
should only be done by an experienced person familiar
with electricity and its dangers.
A fused disconnect switch.
2) Check circuit breaker or fused disconnect switch to make
sure they are turned on. Sometimes circuit breakers need
to be turned on and off to reset them.
3) If you have a fused disconnect check the fuses with
your voltmeter for continuity. CAUTION: This test should
only be done by an experienced person familiar with
electricity and its dangers.
4) Make sure fuses or circuit breaker are the proper
amperage and type. See wiring diagram for details.
5) Test for voltage at the main power supply as close to
the kiln as possible. CAUTION: This test should only be
done by an experienced person familiar with electricity
and its dangers.
Control Transformer
See this video:
hotkilns.com/check-control-transformer
and
hotkilns.com/change-transformer.
1) If none of these solve the problem then you could
have a bad control transformer. To check the transformer
operation test with your digital multimeter. It should read
240 (or 208) volts across terminals 1 & 4 (black and white
wires) and 24 volts across terminals 5 & 8 (where the gray
and brown wires come out). This is a live test so be very
careful not to touch any of the wires - remember there is
240 volts in the panel and this can electrocute you. See
photo below. If you are receiving 240/208 Volts in, but not
getting the proper approximate 24 Volts out, then you need
to replace the control transformer. See:
hotkilns.com/
control-transformer-12-va
2) If there is no voltage coming into terminals 1 & 4, white &
black, then test for it at the Power Terminal Block where the
power cord comes in. If there is power there then look for a
bad connection or wire between the power connection block
and the transformer, i.e. a bad toggle switch, wire, or ½ amp