Problem Solving - Barnstead 30400 Operation Manual

The Problem Solving section is intended to aid in defining and correcting possible service problems. When
using the chart, select the problem category that resembles the malfunction. Then proceed to the possible
causes category and take necessary corrective action.
Problem
The cycle light does
not illuminate.
The furnace does not heat.

Problem Solving

Probable Causes
The furnace is not connected to
power supply.
ON and OFF power switch is
defective.
Door switch defective.
Incorrect power source.
Defective circuit breaker.
No power.
Defective electrical hookup.
Thermocouple has oxidized
and opened the circuit.
Controller malfunction.
Two or more heating elements
burned out.
Door switch malfunction.
Defective safety relay.
Defective solid state relay (SSR)
Corrective Action
Check furnace connection
to power source.
Replace power switch.
Realign door strike or
replace door safety switch.
Check power source.
Replace circuit breaker.
Check power source and fuses or
breakers.
Repair electrical hookup.
Replace thermocouple.
Contact customer service.
Replace defective elements.
Realign door strike or replace door
safety switch.
Replace safety repay.
Replace SS relay.
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