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6-16
TROUBLESHOOTING THE WATER HEATING SYSTEM
Each of the following checks is to be performed with the unit connected to the
electrical power supply, with the computer ON and calling for heat, and with at least
enough water in the cookpot to cover the lower water-level sensor.
Is resistance
between Pins 5 and
8 of the 15-pin plug
1 ohm or less?
High-limit has
failed. Replace.
High-limit is OK.
Yes
No
CHECKING THE
HIGH-LIMIT
THERMOSTAT
Is 27-33VDC
present at Pin 4 of the 15-
pin plug when computer is
calling for heat?
Computer has
failed. Replace.
Yes
CHECKING THE
COMPUTER
(24VAC Power Supply
verified to be OK.)
Yes
Computer is OK. No
CHECKING
THE TEMPERATURE
PROBE
(Because water boils in
Simmer Mode or water
is too cool in Simmer
Mode.)
Check probe resistance between Pins
13 and 14. Resistance should be:
Approx 552 ohms @ 60ºF (16ºC)
Approx 655 ohms @ 100ºF (38ºC)
Approx 1000 ohms @ 212ºF (100ºC)
Check resistance between each pin and
ground. Resistance on BOTH should be
2 mega-Ohms or greater.
Are BOTH readings
within specification?
Probe is open or is
shorted. Replace.
Probe is OK.
No
Yes
Adjust controller in
accordance with instructions
in Section 3.1.3.
If this does not correct the
problem, continue.
CHECKING THE
SOLID-STATE RELAYS
AND ELEMENTS
(24VAC Power Supply
verified to be OK..)
With the computer
calling for heat, is voltage across
the input terminals of the relay zero
with line voltage across the output terminals?
AND
With the computer NOT calling for heat, is
voltage across the input terminals of
the relay 5-10VDC with no
voltage across the
output terminals?
No
Relay has failed.
Replace.
Yes
Place the master ON/
OFF switch in OFF
position then back in
the ON position.
Solid-state relays are OK.
Ohm out elements (Pins 1 & 6,
2 & 5, 3 & 4). If resistance
is NOT 15 ±3 Ohms, the element
has failed. Replace.