Form I-RA/D 140/235 (Version A), Mfg No. 110318 Rev 4, Page 45
Does
the
fan/blower
operate?
Check
for line
voltage across
fan/blower leads.
Is voltage
read?
Check
for line voltage
across Terminals
1 and 2.
Is voltage
read?
Are the
heat exchanger
surfaces and/or fan
blades or blower
covered with
dirt?
Have
ducts or air
deflectors been added
to a fan (RA) model? Is the
temperature rise of blower
model (RAD)
above
70°F?
Replace
fan/blower
motor.
Replace air
discharge limit
(fan/limit assembly).
Check wiring.
Replace air
discharge limit
(fan/limit assembly).
Clean the heat
exchanger and
fan/blower.
Remove ducts or
deflectors from fan
model. Lower
temperature rise
on blower model.
YES
YES
YES
YES
NO
NO
NO
NO
NO
YES
Chart No. 6 - High Temperature Limit Cycles*
*High temperature limit cycles when internal temperature exceeds
limit setpoint. Cause must be found and corrected for heater to
function safely/properly.
Refer to illustration on page 46.
