The Dometic TPR A-550 Relay Control Board is the command center for your RV's water heating system. This OEM control board manages the heating cycles, safety shutoffs, and operational modes of Dometic tankless water heaters. If your water heater won't ignite, cycles incorrectly, or shows error codes, a faulty relay control board is often the culprit.
- OEM Dometic replacement part for TPR A-550 heating systems
- Controls ignition, flame detection, and thermal safety functions
- Direct replacement—no modifications required
- Restores full automatic operation and diagnostic capabilities
- Compatible with standard 120V RV electrical systems
- Tested and verified before shipment
| Specification | Details |
|---|---|
| Part Number | 290339711 |
| Manufacturer | Dometic |
| System Compatibility | TPR A-550 Tankless Water Heater |
| Voltage | 120V AC |
| Function | Relay control and ignition management |
| Installation | Plug-and-play replacement |
Frequently Asked Questions
Q: How do I know if my relay control board is bad?
A: Common signs include: water heater won't turn on, ignition clicks but no flame, system cycles on and off repeatedly, or error lights remain on. A multimeter test of the board terminals can confirm failure.
Q: Will this work with my older Dometic water heater?
A: This board is designed specifically for TPR A-550 systems. Check your heater's model number on the front panel or in your RV documentation. Using the correct part number ensures compatibility.
Q: Is installation difficult?
A: Most RV owners can replace this board in 10-15 minutes. Disconnect power, locate the board (usually mounted inside the heater cabinet), unplug the connector, and swap in the new unit. Refer to your heater's manual for exact location.
Why Choose Elkhart RV Parts
We specialize in hard-to-find Dometic replacement parts for RV owners who need the exact OEM component—not aftermarket substitutes. Shipping directly from Elkhart, Indiana, the RV capital of the world, we stock genuine parts and provide expert support to help you identify the right replacement. Every part is verified before it ships to ensure you get back on the road quickly.
| Brand | Dometic |
|---|---|
| Product_type | Relay Control Board |
| Model | TPR A-550 |
| Part_number | 290339711 |
| Part_category | Service Part |
| System_type | Thermal Management / Climate Control |
| Oem | true |
| Rohs_compliant | true |
| Compatibility | Dometic TPR A-550 thermal management systems |
| Application | RV Climate Control |
| Intended_user | Technicians and DIY RV owners |
| New_arrival | true |
Factory-Fresh OEM Parts — the same brands installed in new RVs straight from Elkhart. Genuine, name-brand components made to order — never generic, never outdated. Sourced directly from the original RV manufacturers for perfect fit and factory-level quality.