Full Product Manual

www.usaprocom.com
160108-01C12
TROUBLESHOOTING
DISPLAY POSSIBLE CAUSE REMEDY
Display shows C7 Control
button stuck.
1. One or more of the control
buttons is depressed continu-
ously (stuck).
2. Defective control assembly.
1. Unplug heater. Depress and
release each control button
several times to check opera-
tion. Every button should click
every time it is depressed.
2. Replace control assembly.
Display shows C8 Te m -
perature Over 100°F.
1. Room or ambient tempera-
ture exceeds 100°F.
1. Operate heater in a cooler
environment.
Display shows C9 Low
Pressure (Setting 5).
1. Air line or tting leaking.
2. Pump cover leaking. Pump
cover screws loose.
3. Pump cover gasket leaking.
Pump output lter clogged.
4. Pump pressure is low.
5. Pump pressure is low. Can-
not adjust to specification.
Pump lters are dirty.
6. Pump pressure is low, pump
has excessive wear or im-
proper adjustment.
1. Unplug heater. Check air
lines and fittings of leaks.
Correct all leaks.
2. Unplug heater. Check pump
cover for leaks. Tighten pump
cover screws to 10-20 in-lbs.
3. Unplug heater Replace pump
output lter. See Pump Rotor,
page 17.
4. Adjust pump pressure to
specication. See Pump Pres-
sure Adjustment, page 14.
5. Replace pump filters. See
page 13.
6. Adjust pump rotor gap or re-
place pump rotor and blades.
See page 17.
WARNING: High voltage! Unplug heater before servicing.
FAULT CONDITION
(Continued) Heater ignites but control assembly shuts heater off before
running out of fuel.