Owens Corning 313221M, Instruction & Parts Manual

Page: 30 / 60

Troubleshooting
30 313221M
No temperature display. Loose display cables on control
board. Check cable connections to each dis-
play, page 38.
Failed control board (displays get
power from control board). Remove access panel. Check if
board LED is lighted. If not, replace
board, page 38.
Inadequate power to control board. Check that power supply meets
requirements.
Loose power cable. Check cable connections, page 38.
Motor Power switch circuit breaker
tripped. Display is powered from Motor Power
circuit breaker. Cycle Motor Power off
, then on to reset
breaker.
Wrong temperature displayed. °F/°C switch in wrong position. Set switch, see page 36.
Temperature displays do not match
at ambient temperature. Displays need calibration. Turn calibration screw on back of dis-
plays to correct reading, see page
36.
No heat, and heater indicator light is
off. Heater Power shut off, or circuit
breaker tripped.
Cycle Heater Power off , then
on to reset circuit breaker.
Bad thermostat. With power on, check for continuity at
clicks of heater control knob. To
replace thermostat, see 311210.
Bad overtemperature sensor (this is
a high temperature limit fuse and
must be replaced if blown). With power on, check for continuity at
overtemperature sensor. To replace
sensor, see 311210.
Loose heater cable connections. Check connections at Heater Power
switch. See F
IG
. 12, page 39.
No heat, but heater indicator light is
on. Bad heater cartridge. Check for continuity at heater car-
tridge connections: 16-18.6 ohms for
120 V.
Heater on one side shuts off early or
continuously during recirculation. Inlet strainer (21) is plugged on that
side. Clean or replace strainer, page 22.
B side pump is not priming. Running pump too fast. Put finger over recirculation tube
while running, to build pressure, and
release. Repeat as necessary.
Piston ball check is stuck in open
position.
PROBLEM CAUSE SOLUTION