Table 5-1. Troubleshooting - Continued
8. Flame failure "Red Indicator Light
On". (Flame signal voltage below
j. Fuel piping broken, loose or
j. See malfunction 6, step i.
2V DC) - Continued
k. Water in fuel.
k. Obtain fuel sample from fuel tank
drain and check for water. Drain and
refill fuel tank.
l. Excessive smoke.
l. Adjust air gate for proper air
m. Flame safeguard contacts dirty.
m. See malfunction 2, step h.
n. Defective flame safeguard relay.
n. See service of flame safeguard and
o. Flame relay contact block
o. Inspect contact block, if cocked on
guides, free block to open and close
9. Low nozzle pressure at gun or guns.
a. Inadequate water supply.
a. See malfunction 4.
b. Improper nozzle size on gun or guns
for desired operational mode.
b. Inspect nozzles. Refer to operating
instructions for correct nozzle size for
desired operational mode.
c. Pump by-pass selector valve open
on two gun, high pressure or 600 gph
c. Observe position of selector valve.
pressure or 600 gph operational
d. Worn vapor or rinse nozzles.
d. Remove and inspect nozzles, replace
e. Soap agitator valve open.
e. Observe valve position, close valve.
f. Pump by-pass valve setting too low
or valve leaking.
f. Turn valve adjusting screw clock-
wise to increase pressure. Use coil
outlet gage to set relieving pressure.
Valve should be set at 370 psi.
Excess pressure switch must be
jumped to set valve, as it opens at
350 psi and will shut down pump. Set
valve to proper relieving pressure.
Inspect valve, seat and O-ring for
any foreign materials or damage.
Repair or replace valve parts as
g. Worn check valves, springs or cups
in water pump.
g. Remove pump head assembly and
springs and cups for wear or damage.
Replace parts as necessary.
h. Faulty bearings or loose connecting
rod in pump.
h. Pump operates noisily. Remove
pump and disassemble. Inspect for
Remove and inspect connecting rods.
Inspect bearings and race bearings
for damage or wear. Replace or repair
parts as necessary.
i. Coil outlet safety relief valve
i. Water emitting from valve. Reset,
repair or replace valve as necessary.
Valve set to relieve at 400 psig.
j. Restriction in pump suction filter or
suction inlet line.
j. Clean intake filter and hoses or clear
10. Low operating temperature.
a. Improper thermostat setting.
a. Outlet temperature gage indicates
perature by turning the thermostat
adjusting screw counterclockwise.
b. Inadequate oil supply to burner.
b. See malfunction 6.
c. Dirty or restricted burner nozzles.
c. See malfunction 9, step g.
d. Scale buildup in coil.
d. Remove cleaning gun nozzles and
conduct back pressure check. If
differential pressure between back