Bosch Range Error Codes: Complete Diagnostic Guide

Common Symptoms

• E0 displayed — control/display board 00649008 fault, oven unresponsive or display scrambled
• E1 displayed — oven won't heat, temperature sensor 00494280 open circuit (reads OL instead of 1,080–1,100Ω)
• E2 displayed — oven overtemperature alarm or heating lockout, sensor shorted (near 0Ω at room temp)
• E3 displayed — bottom bake element failed, oven won't reach temperature (800 series: separate code for dedicated convection element)
• E4 displayed — top/broil element 00245522 failed, broil function unavailable
• E5 — door lock fault, self-clean cycle won't start or door stuck locked after pyrolytic cycle
• E15 or E16 on induction model — E15 cooling fan fault; E16 power module overtemp requiring 12-minute cool-down before reset

Most Likely Causes

1. 1

   E0 — Display / Control Board Fault (00649008)

   E0 on a Bosch range means the display and control board assembly 00649008 has detected an internal fault — EEPROM corruption, a failed relay, or a communication error within the board. A 2-minute power cycle (circuit breaker off) sometimes resolves a transient E0 from a voltage spike. If E0 returns after power cycling, control board 00649008 must be replaced. Note: Bosch uses the '00' prefix on all OEM service parts — do not order parts without this prefix as they are not genuine Bosch components. The 500 series and 800 series use different board variants even for the same model year — confirm the exact part number using your full model number and serial number at bosch-home.com/parts. Bosch 800 series boards include additional firmware for the dedicated convection element and have separate E-codes not present on 500 series boards.

2. 2

   E1 — Oven Temperature Sensor Open Circuit (00494280, 1,080–1,100Ω at room temp)

   E1 means the oven NTC temperature sensor 00494280 has an open circuit — the control board reads infinite resistance (OL) instead of the expected 1,080–1,100Ω at room temperature (68–77°F). Bosch uses NTC thermistors, not the RTD sensors used by GE or Maytag — the resistance specs and temperature curves are different. A working Bosch oven sensor 00494280 reads 1,080–1,100Ω at room temperature. An open circuit confirms sensor failure. E1 is especially common after multiple pyrolytic self-clean cycles on HBL8453UC models — repeated exposure to 900°F degrades the NTC element over time. Do NOT substitute a non-Bosch RTD sensor — resistance-temperature curves are incompatible and will cause incorrect temperature readings and potential overtemperature conditions.

3. 3

   E2 — Temperature Sensor Shorted (00494280)

   E2 indicates the oven temperature sensor 00494280 has shorted — the multimeter reads near 0Ω instead of 1,080–1,100Ω. A shorted sensor causes the control board to interpret the reading as an impossibly high temperature and lock out the heating elements to prevent a runaway. On HGI8054UC gas models, the sensor harness runs along the oven cavity rear wall — it can abrade against the oven liner if racks are removed roughly. Replace 00494280 if resistance reads below 500Ω at room temperature. Also check the harness for insulation damage — a shorted harness wire produces the same E2 code as a shorted sensor probe. Bosch NTC resistance spec: if the sensor reads between 500Ω and 2,500Ω but not in the 1,080–1,100Ω band, replace the sensor.

4. 4

   E3 — Bottom Bake Element Open Circuit (HEZ23414 / 00684647)

   E3 on Bosch electric and dual fuel ranges means the bottom bake heating element has an open circuit — tested with a multimeter, a failed element reads OL where a working element reads 20–40Ω. The bottom element on HEI8054UC is part number HEZ23414 (also listed as 00684647 in BSH service catalogs — both reference the same part). Disconnect power before testing: remove the 2 screws holding the element in the oven floor, pull the element forward to access the spade connectors, disconnect the wires, and probe resistance. OL = failed element = replace HEZ23414. Note: Bosch 800 series models with a dedicated convection element generate a separate E-code when that element fails — E3 on 800 series specifically points to the bottom element, not the convection element.

5. 5

   E4 — Top / Broil Element Open Circuit (HEZ834000 / 00245522)

   E4 means the top broil element has an open circuit. The Bosch broil element is part number HEZ834000 (also listed as 00245522). On HEI8054UC and HBL8453UC, the broil element is mounted at the top of the oven cavity. Disconnect power, remove the 2 element mounting screws, pull the element down slightly to access the wire terminals, disconnect, and probe resistance. Working broil element reads 20–40Ω; OL = failed = replace HEZ834000. Visual inspection is also useful: a broil element that has blown open shows a visible crack or melted area at the failure point. E4 affects only the broil function — the bake function with the bottom element remains operational while E4 is active.

6. 6

   E5 — Door Lock Fault

   E5 means the door lock mechanism failed to complete its travel — either during the lock-on sequence at the start of a pyrolytic self-clean cycle or during the unlock sequence at cycle end. The door lock motor on Bosch ranges uses Torx T20 fasteners for access — not Phillips. If E5 appears at end of pyrolytic cycle with the door remaining locked: (1) allow the oven to cool completely — the thermal interlock prevents unlocking until the cavity drops below approximately 300°F; (2) try a 2-minute power cycle; (3) if still locked, access the manual release through the rear top panel (Torx T20 screws) — a flathead screwdriver through the motor gear access slot rotates the latch bolt to the unlocked position manually. After manual release, the door lock assembly must be tested before attempting another pyrolytic cycle. European-style door hinge replacement on HBL8453UC and HIIP054U uses hinge set HEZ9SE130 — Bosch hinges differ from US-brand hinge designs.

7. 7

   E6 / E15 — Cooling Fan Fault

   E6 on gas and electric Bosch ranges (HGI8054UC, HEI8054UC) and E15 on induction models (HIIP054U) both indicate the cooling fan is not running. The cooling fan circulates air across the electronics behind the control panel and must run when the oven is in use. To diagnose: with the oven powered and set to any function, listen for fan noise from the rear vent slots. No audible airflow = fan failed. Access the fan by removing the rear top panel (Torx T20). Disconnect the harness and probe the fan motor winding resistance — working Bosch cooling fan reads 100–400Ω; OL = failed winding. On HIIP054U induction models, E15 cooling fan fault is more critical than on conventional models because induction power modules generate significantly more heat and require continuous cooling.

8. 8

   E7 / E16 — Convection Motor Fault / Induction Power Module Overtemp

   E7 means the convection fan motor in the rear wall of the oven cavity has failed — the motor that circulates hot air during convection cooking mode. On HEI8054UC, the convection motor is accessible by removing the back panel of the oven cavity (Torx T20 fasteners). Probe the motor winding resistance: working convection motor reads 50–200Ω; OL = replace. E16 on HIIP054U induction models is a different code — it indicates the induction power module has reached its thermal protection threshold. E16 requires a mandatory 12-minute cool-down before the range can be reset: (1) press Stop/Cancel; (2) switch off the circuit breaker for 30 seconds; (3) restore power; (4) wait 12 full minutes before attempting to use the cooktop or oven — the power module must cool completely. If E16 returns within one cooking session, the cooling system has a persistent fault (likely E15 cooling fan) that must be resolved first.

Quick DIY Checks

1. 1Perform a 2-minute power reset: switch off the Bosch range at the circuit breaker (or unplug if accessible) for a full 2 minutes. Restore power and observe the display. E0 (transient EEPROM fault) and E5 (after a completed pyrolytic cycle with a fully cooled oven) sometimes clear with a power cycle. If the code returns immediately or within 1–2 minutes of normal operation, proceed to component-specific diagnosis. Exception: E3 and E4 are element open-circuit faults and will not clear with a reset — physical element replacement is required.
2. 2Test the oven temperature sensor 00494280 for E1 / E2 (spec: 1,080–1,100Ω at room temperature): disconnect power at the circuit breaker. Allow the oven to cool completely — the sensor probe operates at oven temperature and must be fully cooled before testing. Open the oven door and locate the NTC sensor probe in the upper-rear oven cavity wall — remove the 2 Torx T20 screws securing the sensor bracket. Pull the probe 3–4 inches into the cavity and disconnect the 2-wire harness connector. Set your multimeter to Ω (resistance) mode and probe the two sensor terminals. Spec: 1,080–1,100Ω at room temperature (68–77°F). E1 = OL (open circuit) — replace 00494280. E2 = near 0Ω or below 500Ω (shorted) — replace 00494280. Critical: do NOT substitute a GE WB21X5243 or Maytag W11130679 sensor — Bosch NTC curves are incompatible with US-brand RTD sensors.
3. 3Test bottom element HEZ23414 / 00684647 for E3: disconnect power at the circuit breaker. Open the oven door and remove the oven racks. Locate the bottom bake element mounted on the oven floor — remove its 2 mounting screws, pull the element forward 6–8 inches to expose the wire spade connectors, and disconnect the wires. Set your multimeter to Ω (resistance). Probe the two element terminals: working Bosch bottom element reads 20–40Ω; OL = failed element — replace HEZ23414. Visual inspection: a failed element often shows a visible crack, blister, or melted spot at the failure point. On Bosch 800 series models, note that E3 specifically identifies the bottom element — the dedicated convection element on 800 series generates its own separate E-code when it fails.

1. 4Test broil element HEZ834000 / 00245522 for E4: disconnect power. The broil element is mounted at the top of the oven cavity on HEI8054UC and HBL8453UC. Locate the element's 2 mounting screws on the top cavity wall, remove them, and gently lower the element to access the wire connectors. Disconnect the wires and probe resistance: working element reads 20–40Ω; OL = failed element — replace HEZ834000. If the element tests good (resistances within range) but E4 persists, test the harness for continuity from the element terminals to the control board — a broken wire in the harness produces the same E4 code as a failed element.
2. 5Diagnose E5 door lock fault — Bosch European-style hinge note: if E5 appears after a pyrolytic self-clean cycle with the door remaining locked, first confirm the oven has fully cooled (allow 90 minutes minimum after cycle end). Then: (1) press the Stop/Cancel button to send an unlock command; (2) if the door doesn't release, switch off the circuit breaker for 2 minutes, restore, and retry; (3) if still locked, access the manual release via the rear top panel (Torx T20) to manually release the latch bolt. After manually releasing: if you need to replace the door lock motor assembly, note that HBL8453UC and HIIP054U use European-style door hinges (hinge set HEZ9SE130) which differ significantly from US-brand hinges — the door must be removed using the Bosch-specific hinge release technique before the lock assembly can be replaced. Follow the Bosch service manual procedure for your specific model number.
3. 6Verify gas soft-start ignition on HGI8054UC — clicks before lighting are normal: Bosch gas ranges use a soft-start ignition sequence — the igniter clicks up to 3 times before the burner lights. This 3-click delay is by design and does NOT indicate a fault. If the igniter clicks more than 10 times before lighting (or fails to light at all): (1) check LP/NG gas pressure — low pressure is the most common cause of ignition failure on Bosch gas models; LP tanks require minimum 20–30% capacity, natural gas requires minimum 7 inches water column (7" WC) at the appliance; (2) inspect the igniter cap on the affected burner for cracks or debris; (3) verify the gas valve is fully open. If all burners fail to ignite simultaneously, suspect the main gas supply, not the individual burners. Do not replace igniters without first confirming adequate gas pressure.
4. 7Execute E16 induction power module cool-down protocol on HIIP054U: E16 means the induction power module has reached thermal protection temperature. Mandatory 12-minute cool-down procedure: (1) press Stop/Cancel on the control panel; (2) switch off the circuit breaker for 30 seconds; (3) restore power; (4) do NOT attempt to use the cooktop or oven for 12 full minutes — the power module's thermal protection must fully reset; (5) after 12 minutes, attempt normal operation. If E16 returns within one hour of cooking, the cooling system has a persistent fault: check for E15 (cooling fan) before E16 recurs — a failed cooling fan is the most common cause of repeated E16 events. Repeated E16 without a cooling fault indicates the power module is failing internally.
5. 8Check Bosch warranty and register at bosch-home.com: Bosch offers a 5-year limited warranty on parts (not labor) when the range is registered within 30 days of installation. Labor warranty is 1 year from purchase. Before ordering any E-code parts, verify whether your range is still within the parts warranty period — a control board 00649008 at $200+ may be fully covered. Registration and warranty lookups are available at bosch-home.com. When calling Bosch service (1-800-944-2904), have your model number and serial number ready — both are on the rating plate inside the oven door frame. 800 series models have a separate service program for certain known failure modes.

Repair vs Replace

Recommended Tools & Parts

• Bosch Control Board 00649008

  Display and control board for Bosch HEI8054UC, HGI8054UC, and compatible models. Fixes E0 (board fault). Model-specific — 500 series and 800 series use different board variants. Confirm exact part number at bosch-home.com/parts using model and serial number. May be covered under Bosch 5-year parts warranty.

  $180–$300

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• Bosch Oven NTC Temperature Sensor 00494280

  NTC temperature sensor for Bosch HEI8054UC, HGI8054UC, HBL8453UC, and compatible models. Fixes E1 (open) and E2 (shorted). Should read 1,080–1,100Ω at room temperature. Do NOT substitute a US-brand RTD sensor — Bosch NTC curves are incompatible.

  $25–$50

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• Bosch Bottom Bake Element HEZ23414 / 00684647

  Bottom bake heating element for Bosch HEI8054UC and compatible electric/dual fuel models. Fixes E3 (bottom element open circuit). Test resistance before ordering (working: 20–40Ω; OL = failed). Also listed as 00684647 in BSH service catalogs.

  $40–$80

  Buy on Amazon →

• Bosch Broil Element HEZ834000 / 00245522

  Top/broil heating element for Bosch HEI8054UC, HBL8453UC, and compatible models. Fixes E4 (broil element open circuit). Test resistance before ordering (working: 20–40Ω; OL = failed). Also listed as 00245522 in BSH service catalogs.

  $30–$70

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• Bosch Door Hinge Set HEZ9SE130

  European-style door hinge replacement set for Bosch HBL8453UC, HIIP054U, and compatible built-in models. Required when replacing door lock assembly or servicing door components — Bosch European-style hinges differ significantly from US-brand designs and require model-specific release technique.

  $50–$120

  Buy on Amazon →

• Torx T20 Screwdriver / Bit Set

  Mandatory for all Bosch oven panel and sensor access. Bosch uses Torx T20 fasteners throughout — not Phillips. A quality T20 bit is required before beginning any Bosch range disassembly.

  $8–$20

  Buy on Amazon →

• Digital Multimeter

  Essential for testing Bosch NTC sensor resistance (1,080–1,100Ω spec), element resistance (20–40Ω), fan motor continuity, and voltage verification. Required for all Bosch range E-code diagnosis.

  $15–$40

  Buy on Amazon →

Links are Amazon affiliate links (tag: fixitfastai-20). Prices are estimates.

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