Viking Wall Oven Repair in Toronto — Oven not heating at all

• Gas cavities, weak glow-bar igniter (the #1 Viking no-heat fault): the bake/broil hot-surface igniter (PB040001 = AP5315579 / 065650-000, replaces 792263) ages and loses amperage draw, so it glows but never pulls enough current to open the gas safety valve - the oven stays cold. The honest field test is the >90-second rule: if the igniter glows red for more than ~90 seconds without the burner lighting, it has dropped below the amperage the valve needs and gets replaced. Viking's glow-bar design pairs a bake and a broil igniter, so on bake-side no-heat we replace the bake igniter (and counsel both, since a weak partner usually follows within months).
• Igniter glows bright and normal but the burner still won't light - that points past the igniter to the dual gas safety valve (PB010084 = AP5315381, bimetal, replaces 810968). The bimetal valve only opens once igniter heat is present; when its coil weakens it never lets gas through despite a perfect glow, so the oven reads as no-heat with a healthy-looking igniter. Per Viking's own fitment this valve covers all non-DSI ignition systems except the VGR classic line, so we confirm the ignition platform by model/serial before ordering, and amp-test the igniter first so we don't condemn a good valve.
• Electric cavities (VESO / VDSC / DESO platforms), open bake element: the lower bake element (PJ010004 = AP3160650, 240V) burns through or goes open-circuit and the oven powers up with a normal display but never warms from the bottom - uneven or no bake. A continuity/resistance check across the element terminals confirms it (often with a visible blister or burn-through at the loop); this is a confirm-and-swap, not a control-board chase. Broil-only loss is the upper element on the same platform.
• Bakes hot, cold, or won't hold setpoint - drifted RTD oven temperature probe (PE050206 = AP5316857). As the platinum RTD ages its resistance wanders out of spec, so the control 'thinks' the cavity is a different temperature than it really is and under- or over-feeds the burner/element. On the EOC4 control platform Viking flags this as F02 (RTD sensor open or short). We meter the probe cold against the RTD curve (about 1,085 ohms at room temperature) and check the harness plug at the control before condemning it - a disconnected or corroded sensor lead reads identically to a dead probe on the display.
• F02 sensor-circuit no-heat: when the control reports the oven temperature sensor as open or shorted (Viking F02 on the EOC4 platform), or the board simply can't read the RTD correctly, a control with no trustworthy temperature reference refuses to drive heat. We distinguish a genuinely failed PE050206 probe from a wiring/board-read fault by metering the sensor end-to-end and at the board connector - swapping the probe when the board or harness is the real fault is a frequent false-positive on Viking no-heat calls. (Note for diagnosis: on the same EOC4 platform F03 is a cooling-fan feedback code, not a temperature-sensor code, so we read the fault against the unit's own service chart before quoting a probe.)
• Thermostat / control-side drift on mechanical-control Viking ovens (consistent with the line's known thermostat-drift pattern): on older mechanical units there's no fault code at all - diagnosis is by measurement, and a drifted oven thermostat or a tired gas valve coil can cap the cavity low so the oven 'heats but barely.' We verify against a calibrated oven thermometer before deciding whether it's a calibration offset, a thermostat, or the safety valve, because all three present as 'never gets hot enough.'
• No-heat that is actually a connection, not a component: a corroded or heat-discoloured terminal at the bake element, the igniter spade connectors, or the RTD harness adds resistance that starves the circuit - the element or igniter is fine but never gets full voltage. We inspect and re-seat the high-voltage element terminals and the igniter caps (and look for melt at the connector) before quoting any PJ010004 element, PB040001 igniter, or board, since a harness fix is often the real repair behind an apparent dead heater.

Viking oven not heating at all in Toronto — the local specifics

• The recurring Toronto pattern on Viking no-heat is the gas glow-bar igniter that glows but no longer lights - owners read the visible red glow as 'the igniter works' and assume it's the valve or the board, when the >90-second amp-draw test shows the igniter has quietly fallen below the current the safety valve needs. On the electric VESO/VDSC built-ins it's the opposite tell: a normal display with a stone-cold cavity that meters out to an open PJ010004 bake element. We also see a steady share of F02 sensor calls where a calibrated-thermometer and meter check, not a part swap, settles whether the RTD is genuinely drifted.
• We roll to Viking not-heating calls carrying the PB040001 glow-bar igniter (with its ceramic wire caps) and the PJ010004 bake element for one-visit gas-igniter and electric-element fixes, plus a meter and a calibrated oven thermometer to amp-test the igniter, confirm element continuity, and check the PE050206 RTD against its curve. The PB010084 dual safety valve and the PE050206 RTD probe we confirm by model/serial and pre-order through the Viking channel when the in-home diagnosis points to them.

For the full Viking wall oven module — every fault, part number and code — see Viking wall oven repair in Toronto, and for the same fault across all brands the wall oven oven not heating at all guide.