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.

CHECKING THE

 

 

 

 

CHECKING

 

 

 

 

 

 

 

 

THE TEMPERATURE

 

 

 

 

HIGH-LIMIT

 

 

 

 

 

 

 

 

 

 

 

 

PROBE

 

 

 

 

THERMOSTAT

 

 

 

 

 

 

 

 

 

 

 

 

(Because water boils in

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Simmer Mode or water

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

is too cool in Simmer

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Mode.)

 

 

 

 

Is resistance

 

 

High-limit has

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

between Pins 5 and

 

 

 

 

 

 

 

 

 

 

 

 

 

No

 

 

Adjust controller in

 

 

 

 

 

8 of the 15-pin plug

 

failed. Replace.

 

 

 

 

 

 

 

 

 

accordance with instructions

 

 

 

 

 

 

 

 

 

 

 

 

 

1 ohm or less?

 

 

 

 

 

 

 

 

 

 

 

 

 

in Section 3.1.3.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

If this does not correct the

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

problem, continue.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

High-limit is OK.

 

 

 

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

 

 

 

 

 

 

CHECKING THE

 

 

 

2 mega-Ohms or greater.

 

 

 

 

 

SOLID-STATE RELAYS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

AND ELEMENTS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(24VAC Power Supply

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

verified to be OK..)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Are BOTH readings

 

 

 

 

Probe is open or is

 

 

 

 

 

 

 

 

 

 

No

 

 

 

 

 

 

 

 

 

 

 

within specification?

 

shorted. Replace.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Place the master ON/

 

 

 

 

Yes

 

 

 

 

 

 

 

 

OFF switch in OFF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

position then back in

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

the ON position.

 

 

 

 

Probe is OK.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CHECKING THE

With the computer

 

 

 

COMPUTER

 

 

 

(24VAC Power Supply

calling for heat, is voltage across

 

 

 

verified to be OK.)

the input terminals of the relay zero

 

 

 

 

with line voltage across the output terminals?

 

Relay has failed.

 

 

AND

No

 

Yes

Replace.

 

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?

 

 

 

Is 27-33VDC

 

 

Computer is OK.

No

present at Pin 4 of the 15-

 

 

pin plug when computer is

 

 

 

 

 

 

 

 

calling for heat?

Yes

 

 

 

 

Solid-state relays are OK.

 

 

 

Yes

Ohm out elements (Pins 1 & 6,

 

 

 

 

 

 

 

2 & 5, 3 & 4). If resistance

 

 

 

 

is NOT 15 ±3 Ohms, the element

 

 

 

Computer has

has failed. Replace.

 

 

 

 

 

 

failed. Replace.

 

 

 

 

6-16

Page 47 Page 49
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Frymaster ESW, 17ECS, EWBS manual Troubleshooting the Water Heating System, Probe Thermostat
Page 47 Page 49

17EC, 17ECS, EWBS, ESW specifications

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