Conair Thermolator TW-S User Manual page 90

Uni t Faul ts
The Thermolator has detected a problem with the internal components, wiring, electrical power, or operat-
ing environment. Without correction, the fault could lead to equipment damage or personal injury if it is
not corrected.
• The controller displays an error code indicating the cause of the problem.
• The TCU may take automatic control actions, based on the nature of the fault, to best protect the op-
erator and the TCU until the fault is corrected.
• If the optional alarm package is installed, the fault strobe will illuminate and the audible alarm will
activate.
• Some faults require a power cycle to reset.
Fault
htr
Er
Heater Contactor is Welded
Closed
The heater contactor is NOT dis-
connecting the heater when told
to open by the controller. The
heater is likely running continu-
ously.

Note: This fault is only valid for
units with electromechanical contactors.
Mercury or SSR heater controls do not
produce this error.
WARNING: Only qualified elec-
trical service personnel should
examine and correct problems
that require opening the unit's
electrical enclosure or checking
electrical current.
u ALARM LED illuminated.
u Optional strobe, sounder,
dry contacts actuated.
u Pump locks on.
u Heater locks off (although it
is probably still active due to
malfunction).
u Cooling valve locks open.
Power must be cycled to reset
this fault.
6-18 I Tr o u b l e sh o o ti n g
(Continued)
Possible Cause
Have the electromechanical heat-
er contactor contacts welded shut
and are preventing the contactor
from mechanically shuttling to an
open position?
Is a fault in the control wiring or
controller outputs continuously
powering the heater contactor
coil?
0
NOTE: Although somewhat counter-intuitive, restrictions
in the fluid make it easier for the motor to pump the
fluid, and therefore require less electrical current.
Solution
Replace the heater contactor.
Ensure that the application is a
cooling-based application and
will only require heater operation
for initial machine warm up. For
applications requiring continuous
heating regulation, contact Conair
customer service and inquire
about Mercury or SSR upgrade
kits for the heater contactor.
Contact Conair
Parts and Service
Phone: 800-458-1960
From outside of the
United States,
Call: 814 437 6861
Test voltage between the A1 and
A2 terminals (coil) on the heater
contactor. If 120VAC is found,
the contactor is probably not de-
fective. Troubleshoot the problem
by searching for the source of this
voltage.
(Continued)