Sigma 1457, 1433-000-E, 1456, 1434-000-E service manual Troubleshooting Guide

TROUBLESHOOTING GUIDE

IMPINGER ADVANTAGE GAS OVENS SERIAL NUMBER N28654 AND ABOVE (OVENS WITH PUSH BUTTON CONTROLS)

SYMPTOM	POSSIBLE CAUSE	EVALUATION
Oven fan will not run	Incoming power supply	Check circuit breaker, reset if required. Check power
		plug to be sure it is firmly in receptacle. Measure
		incoming power, call power co. if required.
	Fuse, 10 Amp	Check, replace if necessary.
	Fuse holder	Check, replace if necessary.
	Switch, oven power	Check for line voltage supplied to switch. If no voltage is
		present, trace wiring back to fuse holder. Check
		continuity between switch terminals. Replace switch as
		needed.
	Motor, main fan	Check for line voltage supplied to motor. If no voltage is
		present, trace wiring back to oven power switch. Check
		motor for opens, shorts or grounds.
		WITH POWER OFF: Turn fan blade to check for locked
		rotor.
No control box cooling	Incoming power supply	Check circuit breaker, reset if required. Check power
		plug to be sure it is firmly in receptacle. Measure
		incoming power, call power co. if required.
	Fuse, 10 Amp	Check, replace if necessary.
	Fuse holder	Check, replace if necessary.
	Switch, oven power	Check for line voltage supplied to switch. If no voltage
		is present, trace wiring back to fuse holder. Check
		continuity between switch terminals. Replace switch as
		needed.
	Cooling fan	Check for supply voltage to the cooling fan. If no
		voltage is present, trace wiring back to the fuse holder.
		If voltage is present and motor does not run, check
		motor for opens shorts or grounds.
		WITH POWER OFF: Check for locked rotor.
No automatic control	Incoming power supply	Check circuit breaker, reset if required. Check power
box cooling		plug to be sure it is firmly in receptacle. Measure
		incoming power, call power co. if required.
	Cooling fan thermostat	Check cooling fan thermostat (thermostat closes at
		120°F and opens at 100°F). With cooling fan thermostat
		pre-heated, check for continuity
Control box cooling fan	Cooling fan thermostat	See “Cooling fan thermostat” (NOTE: Thermostat will
continues to run		remain closed if control box temperature remains above
		120°F.
Oven will not heat	Main fan	If not operating, refer to “Oven fan will not run”
S/N N31348 and	Gas supply	Check for adequate gas supply and be sure that the
Below		manual gas shut off valve is open. Also check flexible
		gas line connection.
	Air pressure switch	Check air switch terminals for supply voltage to
		terminals NO2 and COM. If voltage is present on one
		side only, check for air tube blockage or misalignment. If
		these are okay, adjust air pressure switch or replace
		switch as needed.
	Oven cavity hi-limit	Terminals are normally closed, opens at 350°C (660°F).
	thermostat	If open, reset and test oven for proper operation. If
		thermostat will not hold for maximum temperature, and
		oven is not exceeding control setting, check for proper
		location of the capillary bulb in its spring holder. If above
		checks are okay, replace hi-limit thermostat.
	Gas pressure switch	This switch is located inside the gas valve and should
		close when gas pressure is present.

6 Impinger I – Adv Digital – Gas Service Manual – International