A tankless water heater offers endless hot water and saves energy, but like any device, it can develop issues. The Girard tankless water heater is popular in RVs and homes because it is compact, efficient, and reliable. However, users often face challenges ranging from error codes to inconsistent water temperatures. If your Girard tankless water heater is acting up, don’t worry. Understanding the system and following step-by-step troubleshooting can help you fix most problems without calling a technician. This guide will walk you through common issues, error codes, practical fixes, and maintenance tips. Whether you’re new to tankless heaters or have years of experience, you’ll find advice here to keep your Girard unit working smoothly.
How Girard Tankless Water Heaters Work
Before troubleshooting, it helps to know how these heaters operate. Girard tankless water heaters heat water instantly as it flows through the device. There is no storage tank. When you turn on the hot water tap, cold water enters the heater, passes through a heat exchanger, and exits as hot water. The system uses propane gas (in RV models) or electricity (in home versions). Sensors control temperature and flow. If any part fails, the heater may shut down or give error codes.
Main Components
- Heat exchanger: Transfers heat from gas or electric element to water
- Gas valve: Controls propane supply (RV models)
- Electric ignition: Starts the burner
- Control board: Manages sensors and settings
- Water flow sensor: Detects movement of water
- Temperature sensor: Monitors water heat
- Display panel: Shows settings and error codes
Understanding these parts helps you pinpoint problems faster.
Common Girard Tankless Water Heater Issues
Girard tankless water heaters are reliable but can develop several common issues. Here are the most frequent ones:
1. No Hot Water
If you turn on the tap and get only cold water, check these areas:
- Gas supply: Is propane tank full? Is the valve open?
- Electricity: Is the unit powered on? Are fuses intact?
- Water flow: Is there enough pressure? Minimum flow is usually 0.8 gallons per minute.
- Ignition: Does the burner ignite?
2. Fluctuating Water Temperature
Inconsistent water temperature is frustrating. Causes include:
- Low water flow: Tankless heaters require steady flow.
- Dirty filter: Clogged filter reduces pressure and heat.
- Mixer valve issues: If a mixer valve blends hot and cold water incorrectly, temperature will swing.
3. Error Codes And Display Warnings
Girard heaters show error codes on the display panel. Each code means a specific problem. We’ll cover codes and fixes in detail later.
4. Water Leaks
Leaks may happen at fittings, valves, or the heat exchanger. Signs include water puddles, dampness, or corrosion.
5. Strange Noises
Clicking, hissing, or rumbling sounds often mean air in the gas line, scale buildup, or loose parts.
Troubleshooting Girard Tankless Water Heater Error Codes
Error codes are the heater’s way of telling you what’s wrong. Here are the most common Girard error codes and how to fix them.
| Error Code | Possible Cause | Quick Fix |
|---|---|---|
| E1 | Low gas pressure or ignition failure | Check gas supply; reset heater |
| E2 | Low water flow | Increase flow; clean filter |
| E3 | Overheat detected | Check temperature sensor; cool down heater |
| E4 | Temperature sensor fault | Replace sensor; check wiring |
| E5 | Water flow sensor error | Clean or replace sensor |
Let’s look deeper at how to address each code.
E1: Low Gas Pressure Or Ignition Failure
- Confirm propane tank is full and valve is open.
- Inspect gas lines for leaks or blockages.
- Reset the heater (turn power off, wait 30 seconds, turn on).
- Check for air in the gas line—bleed if needed.
E2: Low Water Flow
- Open tap fully; try another faucet.
- Clean inlet filter (usually at water entry point).
- Check for kinks in water hose.
- Ensure minimum flow rate is met.
E3: Overheat Detected
- Turn off heater; let it cool for 15–30 minutes.
- Inspect temperature sensor and wiring.
- Remove scale buildup from heat exchanger.
- Avoid running heater in high ambient temperatures.
E4: Temperature Sensor Fault
- Inspect sensor for damage or loose wires.
- Replace sensor if needed (refer to manual).
- Check control board connections.
E5: Water Flow Sensor Error
- Remove and clean sensor.
- Replace sensor if cleaning doesn’t work.
- Inspect control board for faults.
Non-obvious insight: Many users overlook the impact of low voltage from RV batteries. If batteries are weak, electronic ignition may fail. Always check battery health if you see frequent E1 or ignition errors.
Step-by-step Troubleshooting Guide
Follow these steps when your Girard tankless water heater stops working or shows unusual behavior.
Step 1: Check Power And Gas Supply
- Make sure heater is plugged in and receiving power.
- Inspect circuit breaker or fuse box.
- For RV models, verify propane tank is full and valve is open.
Step 2: Inspect Water Flow
- Open several faucets to test flow.
- Clean inlet filter.
- Check water pump (in RVs).
Step 3: Review Error Codes
- Read display panel for codes.
- Refer to the error code table above.
Step 4: Examine Heater Components
- Look for visible damage, leaks, or loose wires.
- Listen for unusual noises.
Step 5: Reset The Heater
- Turn power off for 30 seconds, then on.
- Many minor glitches clear after a reset.
Step 6: Address Specific Faults
- Based on code or symptoms, fix the issue.
- Replace sensors, clean filters, or adjust settings as needed.
Step 7: Test And Monitor
- After repairs, run the heater and observe for 5–10 minutes.
- Check water temperature and flow.
Practical tip: Always keep a spare sensor and filter on hand. These are the most common parts to fail and are easy to replace.
Girard Tankless Water Heater Maintenance Tips
Regular maintenance prevents most problems and extends heater life.
Cleaning The Inlet Filter
- Shut off water and power.
- Remove filter (usually at cold water entry).
- Rinse under running water; scrub with brush if needed.
- Replace filter and restore power.
Descaling The Heat Exchanger
- Use a descaling solution (follow manufacturer’s instructions).
- Flush through the heater every 6–12 months.
- Helps prevent E3 errors and keeps heating efficient.
Checking Gas Lines
- Inspect for leaks—use soapy water to spot bubbles.
- Tighten fittings and replace worn hoses.
Inspecting Electrical Connections
- Look for loose or corroded wires.
- Use a multimeter to check voltage.
Monitoring Water Flow
- If flow drops, check pump (in RVs) and valves.
- Clean all filters regularly.
Non-obvious insight: Many RV owners forget that vibration during travel can loosen fittings and wires. Check all connections after long trips to avoid unexpected failures.
Comparing Girard Tankless Water Heater Models
Girard makes several tankless heaters. Here’s a quick comparison of popular models:
| Model | Max Flow Rate (GPM) | BTU Output | Display Type | Best For |
|---|---|---|---|---|
| GSWH-2 | 2.4 | 42,000 | Digital | Small RVs |
| GSWH-3 | 3.0 | 60,000 | Touch Screen | Large RVs / homes |
| GSWH-1 | 1.5 | 34,000 | Analog | Compact trailers |
Tip: Higher GPM means more hot water at once—good for bigger families or multiple showers.
When To Call A Professional
While most issues can be fixed yourself, some problems need an expert:
- Persistent leaks from the heat exchanger
- Repeated ignition failures after all checks
- Error codes that won’t clear after sensor replacement
- Smell of gas or signs of electrical burning
Safety warning: If you smell propane, shut off gas, ventilate area, and call a technician immediately.
Practical Troubleshooting Examples
Here are real-world scenarios and solutions.
Example 1: Water Goes Cold In The Shower
- Check for E2 code (low water flow).
- Clean inlet filter and open tap fully.
- If pump is weak (RV), replace or repair.
Example 2: Heater Shuts Off Randomly
- Inspect battery voltage (RV models).
- Tighten electrical connections.
- Look for E1 or E3 codes.
Example 3: Error Code E4 Appears
- Replace temperature sensor (usually a simple plug-and-play).
- Check control board for corrosion.
Example 4: Water Leaks Around Heater
- Tighten water fittings.
- Replace worn O-rings.
- If leak is from heat exchanger, contact service center.
Example 5: Display Panel Is Blank
- Check fuse or circuit breaker.
- Inspect wiring harness.
- Replace display panel if needed.
Girard Tankless Water Heater Vs Traditional Tank Heater
How does a Girard tankless heater compare to a traditional tank heater? Here’s a quick look:
| Feature | Tankless (Girard) | Traditional Tank |
|---|---|---|
| Hot Water Supply | Endless | Limited to tank size |
| Energy Efficiency | High (only heats when needed) | Lower (keeps water hot constantly) |
| Size | Compact | Bulky |
| Maintenance | Filter/sensor cleaning | Tank flushing, anode replacement |
| Installation | Requires good water flow | Simple, but takes space |
Key insight: Tankless heaters need more precise troubleshooting, but offer greater convenience and energy savings over time.
How To Prevent Common Girard Heater Problems
Prevention is easier than repair. Here’s what you can do:
- Clean filters every 2–3 months
- Descale heat exchanger twice a year
- Inspect gas and water lines after every RV trip
- Check battery voltage regularly (for RV models)
- Monitor water flow—don’t use faucets with low pressure
If you follow these steps, your heater will last longer and need fewer repairs.
Girard Tankless Water Heater Parts And Replacement
Some parts wear out and need replacement. Here’s what to expect:
- Sensors: Temperature and flow sensors are easy to swap. Cost is usually $20–$50.
- Filters: Replacement filters cost $10–$25.
- Display panel: If it fails, expect $80–$150 for a new panel.
- Heat exchanger: Rarely fails, but expensive to replace ($300+).
Always buy genuine Girard parts for best results. Generic parts may not fit or last as long.
Girard Tankless Water Heater Installation Tips
If you’re installing a new heater, keep these points in mind:
- Use proper water pressure (check manual for minimum and maximum)
- Install in a dry, ventilated area
- Connect gas and water lines securely
- Test for leaks after installation
- Run heater for 10–15 minutes to check operation
Tip: For RVs, mount the heater firmly to avoid vibration damage.
Troubleshooting Flow Rate And Temperature Problems
Flow rate and temperature are critical for comfort. If either is wrong:
- Use a flow meter to measure water flow
- Adjust mixer valve for desired temperature
- Clean filters and descaling help maintain performance
Example: If two showers run at once and water goes cold, upgrade to a higher GPM model.
Girard Tankless Water Heater Warranty And Support
Girard heaters often come with a 2-year warranty (check your manual). Warranty covers:
- Parts and labor for manufacturing defects
- Replacement of faulty sensors, panels, and valves
To get support:
- Record model and serial number
- Keep purchase receipt
- Contact Girard customer service
For official guides and troubleshooting, see Girard RV Official Site.
Frequently Asked Questions
How Do I Reset My Girard Tankless Water Heater?
To reset, turn off power for 30 seconds, then turn it back on. If you have an error code, clear it by following the manual’s instructions. Always check gas and water supply before resetting.
Why Does My Girard Heater Show An E2 Error?
E2 means low water flow. Clean the inlet filter, open the faucet fully, and check for kinks in hoses. If in an RV, make sure the water pump is working.
What Should I Do If Water Temperature Keeps Changing?
Fluctuating temperature usually means unstable water flow or a dirty filter. Clean all filters and check pump and mixer valve. Descale the heat exchanger if needed.
Can I Install A Girard Tankless Water Heater Myself?
Yes, if you have basic plumbing and electrical skills. Follow the manual carefully. For RVs, secure the heater firmly and check all connections. If unsure, hire a professional.
How Often Should I Clean My Girard Heater’s Filter?
Clean the filter every 2–3 months for best performance. If you use hard water, increase cleaning to monthly. Always shut off water and power before cleaning.
Keeping your Girard tankless water heater in top condition is easy with regular maintenance and careful troubleshooting. Most issues can be fixed quickly if you follow the steps above. Remember, a tankless heater gives you endless hot water and saves energy, but it needs a little attention to stay reliable.
If you ever feel stuck, don’t hesitate to reach out to Girard’s support or a licensed technician. With these tips, your hot water will flow smoothly for years to come.
