8
P/N 1011195 Rev. E 08/17
HI-LIMIT RESET BUTTON
A hi-limit thermostat will turn off electrical
power to the heater and control circuits if the
unit overheats. To reset the thermostat, allow
sufficient time (about 45 minutes) for the unit
to cool down, remove the cap and press the
red reset button located on the rear of the
unit (Figure 4).
If the unit requires continuous resetting,
contact your Authorized Service Agency.
DIAGNOSTIC LEDS
This control board has 4 diagnostic LEDs
described below.
Green (Program)
: When lit, indicates the unit
is in PROGRAM mode.
Yellow (Audio)
: When lit, indicates 10-15
VDC is being supplied to the audio signal. The
audio signal will sound and the LED will be lit
for approximately 3 seconds.
Red (Heat)
: When lit, indicates the unit is
calling for heat by supplying 10-15 VDC to the
solid state relay. When off, indicates the gen-
erator surface is up to temperature.
Green (H2O)
: When lit, indicates that 24
VAC is being supplied to operate the solenoid
valve used in DFW-250 units or to the water
pump used in the DFW-150 units.
NOTE: This LED is only lit for approxi-
mately 1 second.
FAULT CODES
When the programming parameters for
Minutes, Seconds, SHO, or H2O have been
inadvertently changed to a setting above or
below their limits, the unit displays the “ERR”
fault code. If this fault code appears, you
must clear these settings using the following
procedure.
For units with Mfg. No. 9100165 or
9100169:
1. Turn the power off.
2. Press and hold the
SINGLE SHOT
and
PROGRAM
buttons simultaneously.
3. Turn the unit on while holding the
buttons. Release the buttons when the
unit stops beeping.
NOTE: Repeat steps 1 through 3 if the
unit still displays the “ERR” fault code.
4. The display will now register 2:45.
For units with Mfg. No. 9100162:
1. Turn the power off.
2. Press and hold the
UP Arrow
and
DOWN Arrow
buttons
simultane-
ously.
3. Turn the unit on while holding the
buttons. Release the buttons when the
unit stops beeping.
NOTE: Repeat steps 1 through 3 if the
unit still displays the “ERR” fault code.
4. The display will now register 2:45.
NOTE: The SHO and H2O settings should
be adjusted to the recommended settings
shown in the Programming section of this
manual.
DAILY MAINTENANCE
NOTE: Frequency of cleaning is deter-
mined by water conditions, usage and
water filter systems.
1. Turn the power off, unplug the power
cord, and allow the unit to cool down
before proceeding.
2. Check the water pressure regulator
gauge (DFW-250 only) and verify
that it reads 20–25 psi (1.4–1.7 kg/
cm2 or 138–172 kPa). If not, adjust
the water pressure as described
in the Installation section of this
manual. Check the rear water Quick
Disconnect Fitting and Hose Clamp
for leakage. Tighten clamps or replace
parts if needed.
3. Remove the False Bottom, Pan, and
Pan Diffuser (Figure 5).
4. Wash these items in hot, soapy water
and then rinse and wipe dry.
5. Wipe down the Top Cover and the
entire exterior of the unit (Figure 5)
with a clean, hot, damp cloth (not
dripping wet) and wipe dry.
6. Re-install Pan Diffuser, Pan, and False
Bottom.
7. Remove water from the water tank
using a cup.
NOTE: Allow top cover to remain open
overnight. We recommend emptying the
unit of water overnight. Do not leave unit
filled with water overnight.
Figure 4. Hi-Limit Reset Button
Reset Button
Cap
CAUTION
Do not use a sanitizing solution or abrasive
materials. The use of these may cause dam-
age to the stainless steel finish.
CAUTION
If a chemical cleaner is used, be sure it is
safe to use on cast aluminum. Observe all
precautions and warnings on product label.
WARNING
Turn the power off, unplug the power cord, and
all the unit to cool down before performing
any service or maintenance.
WARNING
Be sure to follow all the precautions, proce-
dures, and safety steps listed in the Important
Safety Information section of this manual.
NOTE: Failure to properly clean and dry
the above mentioned items may result
in the accumulation of water/moisture
overnight. This may lead to permanent
damage to the equipment’s finish and its
accessories. This damage is not covered by
warranty.
