520814 RV Furnace Module Board Ignition Control | Atwood Hydro Flame Replacement
$30.00
520814 module board ignition control for Atwood Hydro Flame RV furnaces. Manages spark ignition, flame sensing, gas valve, and safety lockout. Direct replacement for Atwood 520814, 520820, 31501. Compact design, plug-and-play, no programming. Free shipping worldwide.
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520814 RV Furnace Module Board Ignition Control – Atwood Hydro Flame Replacement
The furnace module board (ignition control module) is the electronic control unit that manages the ignition sequence and safety functions of your RV furnace. It controls spark ignition, flame sensing, gas valve operation, and safety lockout. When the module board fails, your furnace may fail to ignite, not stay lit, or enter a safety lockout state.
This 520814 module board ignition control is designed as a direct replacement for Atwood Hydro Flame RV furnaces. It features compact design, reliable spark ignition with flame rectification sensing, 3-trial ignition with 30-minute lockout, and plug-and-play installation.
Compatibility
- Atwood Hydro Flame 85-IV series: 8516-IV, 8520-IV, 8525-IV, 8531-IV, 8535-IV
- Atwood Hydro Flame 89-III series: 8916-III, 8920-III, 8925-III, 8930-III, 8935-III
- Atwood AFMD series: AFMD20111, AFMD25111, AFMD30111, AFMD35111
- Atwood 7900-II series: 7912-II, 7916-II, 7920-II, 7924-II, 7932-II
- Dometic DFMD series (rebranded Atwood)
- Replaces board numbers: 520814, 520820, 31501, 33488, 33727
- Most 16,000-40,000 BTU Atwood/Dometic Hydro Flame furnaces
Specifications
| Parameter | Specification |
|---|---|
| Part Number | 520814 (replaces 520820, 31501, 33488) |
| Voltage | 12V DC (10.5-15V operating range) |
| Ignition Type | Spark ignition (12V spark output, 15kV) |
| Flame Sensing | Flame rectification (microamp sensing) |
| Gas Valve Output | 12V DC, up to 2A |
| Trial Ignition | 3 attempts, 8 seconds each |
| Lockout Time | 30 minutes (manual reset) |
| Pre-Purge | 15 seconds |
| Post-Purge | 30-60 seconds |
| Connections | Wire leads (spade terminals) or pin connectors |
| Mounting | 2-screw mounting (compact footprint) |
| Dimensions | ~3″ × 2.5″ × 1″ (compact size) |
| Operating Temp | -40°F to 180°F (-40°C to 82°C) |
| Certification | CE, RoHS, UL recognized components |
Installation Guide
- Safety first: Disconnect 12V power at the battery. Turn off propane supply. Allow the furnace to cool completely.
- Access the board: Remove the furnace exterior access panel. The module board is typically mounted near the burner assembly.
- Document connections: Take photos of all wiring connections before disconnecting.
- Disconnect wires: Remove all wire connectors from the old board terminals. Note the position of each wire.
- Remove old board: Unscrew the 2 mounting screws holding the board.
- Install new board: Mount the new 520814 board in the same position. Secure with mounting screws.
- Reconnect wires: Connect all wires to the corresponding terminals (refer to your photos). Ensure all connections are secure.
- Test operation: Reconnect 12V power. Turn on propane. Set the thermostat to call for heat. Verify the ignition sequence: pre-purge → spark → gas valve opens → flame ignites → continues. Test at least one complete heating cycle.
Common Symptoms of a Bad Module Board
- Furnace won’t ignite — no spark or gas
- Spark occurs but gas valve doesn’t open
- Flame ignites but won’t stay lit
- Furnace locks out after one attempt (should retry 3 times)
- No spark at the electrode
- Intermittent operation
- Burning smell or visible burn marks
- 12V fuse blows repeatedly
Frequently Asked Questions
Q: What’s the difference between 520814 and 520820?
A: The 520814 is a compact module board without fan speed control. The 520820 includes fan control (high/low speed relay) for furnaces with variable-speed blowers. Both have the same ignition functionality. If your furnace has a single-speed fan, the 520814 is sufficient. If it has high/low fan speed, use the 520820. The 520814 can often be used as a replacement for the 520820 if you don’t need fan speed control (the fan will run at one speed).
Q: How do I reset after a lockout?
A: Turn off 12V power for at least 10 seconds, then turn it back on. This clears the 30-minute lockout. If the furnace continues to lock out, check for underlying issues: gas supply, burner, electrode, fan.
Q: Can I install this myself?
A: Yes. The 520814 is plug-and-play with no programming required. Document your wiring connections, disconnect power, swap the board, reconnect wires, and test. The process takes 20-45 minutes.
Q: Why is there no spark?
A: If there’s no spark, check: (1) 12V power at the board terminals, (2) Spark igniter wire connection at the board and electrode, (3) Electrode gap (should be 1/8″), (4) Spark igniter wire for cracks or damage, (5) Board’s spark output module (may be faulty). If power is present and the wire/electrode are good, the board’s spark output is likely bad and the board needs replacement.
Related Products
- 520820 Circuit Board with Fan Control — Atwood furnace board with high/low fan speed
- 31501 RV Furnace Ignition Board — Compatible with Atwood & Dometic Hydro Flame
- Suburban Ignition Electrode (232286) — Replacement spark probe
Need help with your Atwood furnace ignition module? Contact our technical team with your furnace model number. Free shipping and duties included.
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