Bunn Fast Cup Series Service & Repair Manual page 59

LEFT PANEL
SSR Test Results
Step 9: LED not illuminated on SSR, plus zero amp
reading - Set voltmeter on D/C voltage and
check for 24.0VDC control voltage at SSR
being checked.
Step 10: 24.0VDC should be present when SSR
test button is touched and go to 0.00VDC
when finger is removed from button or 5
second test timeout has elapsed.
Yes voltage - Go to Step 11.
No voltage - Inspect wiring harness for
loose connection before replacing Power
(HV) Board.
Step 11: LED illuminated on SSR, plus zero amp
reading - Check associated heating
components (limit thermostat, heater) for
an open circuit.
Step 12: LED not illuminated on SSR, plus 10.8 Amp
+/-5% is displayed - Replace Solid State
Relay.
PART RELATES TO THE FOLLOWING SYMPTOMS
• Irregular or weak coffee profile
• Active Notice - E-053, 054, 055: Finish, PreHeat
& Inlet Tank Heating
• Active Notice - E-059, 060, 061: Finish, PreHeat
& Inlet Tank Over Temp
SERVICE
Load Side
Load Side
Control Side
59
SSR - Finish
Tank/Element
SSR
Inlet Tank/Element
SSR - PreHeat
Tank/Element
8 & 10
Control Side
LED
8