8
P/N 1010678 Rev. K 08/12
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 5).
If the unit requires continuous resetting,
contact your Authorized Service Agency.
DIAGNOSTIC LEDS
TIMER MODELS
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/DFWT/DFWF-250 units or
to the water pump used in the DFW/DFWT-
150 units.
NOTE: This LED is only lit for approxi-
mately 1 second.
NON-TIMER MODELS ONLY
This control board has 2 diagnostic LEDs
described below.
Yellow (CR2)
: If lit, indicates the thermistor
probe is disconnected or open. The thermistor
should be 100k ohms +/- 2% at room tem-
perature.
NOTE: The unit will not call for heat. This
LED should NOT be lit during normal
operation.
Red (CR4)
: When lit, indicates that the unit is
calling for heat by supplying 15-20 VDC to the
solid state relay. When off, indicates that the
Generator surface is up to temperature.
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.
1. Turn the power off.
2. Press and hold the
PROGRAM
and
START/STOP
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 15:00.
NOTE: It is recommended that the SHO
and H2O settings 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/DFWT/DFWF-200/250
units only) and verify that it reads
20–25 psi (1.4–1.7 kg/cm2 or 138–
172 kPa). If not, adjust the water pres-
sure 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 trivet and pan (Figure 6).
4. Wash items in hot, soapy water and
then rinse and wipe dry.
5. Wipe down the top cover, gasket, and
the entire exterior of the unit (Figure
6) with a clean, hot, damp cloth (not
dripping wet) and wipe dry.
6. Re-install diffuser, pan and trivet.
NOTE: Allow top cover to remain open
overnight.
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.
Figure 5. 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.
