Conair Thermolator TW-S User Manual page 91

Un it Fa u lts
(Continued)
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
Er2
Heater Contactor is NOT Clos-
ing
The heater contactor is NOT
closing when told to open by the
controller. The heater is likely
not able to run.

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.
u Cooling valve locks open.
Power must be cycled to reset
this fault.
Possible Cause
Has the electromechanical heater
contactor become jammed and
is being prevented from me-
chanically shuttling to a closed
position?
Is a fault in the control wiring or
controller outputs failing to pro-
vide power to the heater contactor
coil?
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 never
found, the contactor is probably
not defective. Troubleshoot the
problem by searching for why the
control signal is not reaching the
heater contactor coil.
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Tro ub l es hoo ti n g I 6-19