The Girard Tankless Water Heater GSWH-2 is a popular choice for RV owners and those who want endless hot water without the bulk of a traditional tank. Its compact size, energy efficiency, and ability to deliver hot water on demand make it a preferred option for both new installations and upgrades. However, like all appliances, the GSWH-2 can sometimes develop issues that interrupt your hot water supply. If you’re facing problems such as cold showers, error codes, or inconsistent performance, knowing how to troubleshoot your unit can save you time, money, and frustration.
This guide covers everything you need to know about Girard Tankless Water Heater GSWH-2 troubleshooting. You’ll learn how the system works, what can go wrong, and how to fix common problems step by step. We’ll also discuss advanced troubleshooting, maintenance tips, and when to call a professional. Whether you’re an RV enthusiast or a first-time user, this article will help you keep your hot water running smoothly.
Understanding The Girard Gswh-2: How It Works
Before you start troubleshooting, it’s important to understand how the GSWH-2 tankless water heater operates. This will help you identify which part of the system might be causing trouble.
The GSWH-2 uses propane gas to heat water only when you open a hot water tap. It has an electronic control board, sensors for water flow and temperature, a gas valve, ignition system, and safety features. When you turn on the hot water, the following happens:
- The water flow sensor detects movement.
- The control board opens the gas valve.
- The ignitor creates a spark to light the burner.
- The flame heats the water as it passes through the heat exchanger.
- Sensors monitor the water temperature and adjust the flame as needed.
If any of these steps fail, you may have no hot water, error codes, or other issues.
Common Symptoms And What They Mean
Troubleshooting starts with understanding the symptoms your GSWH-2 is showing. Here are the most common signs and what they usually indicate:
- No hot water: The unit is not firing, or water flow is insufficient.
- Fluctuating water temperature: Sensors or gas flow may be inconsistent.
- Error codes: The control panel is reporting a specific fault.
- Unit won’t turn on: Power supply or control board problem.
- Strange noises: Debris or scale inside the unit.
Noticing exactly what happens when you try to use hot water is the first step to solving the problem.
Basic Troubleshooting Steps
Let’s begin with the most common fixes. Many issues can be resolved with these basic checks, especially if your GSWH-2 suddenly stops working.
1. Check Power Supply
The GSWH-2 requires 12V DC power to operate. If it isn’t getting power, nothing will work.
- Ensure your RV battery is charged and the system is getting at least 10.5V.
- Check the fuse for the water heater, usually located in your RV’s fuse box.
- Inspect the wiring and connections for corrosion or loose contacts.
Non-obvious insight: Even a low battery can cause the unit to act strangely or fail to ignite, so always test voltage with a multimeter at the water heater terminals.
2. Verify Propane Gas Supply
No propane means no hot water.
- Make sure the propane tank is not empty.
- Open the valve fully.
- Check for kinks or leaks in the gas line (never use open flame—use soapy water on fittings).
- Confirm other propane appliances (like your stove) are working.
Tip: After changing tanks, it can take a few attempts to purge air from the gas line before the heater ignites.
3. Inspect Water Flow
The GSWH-2 needs a minimum water flow (about 0. 85 GPM) to operate.
- Open the hot water tap fully.
- Ensure no other fixtures are restricting flow.
- Clean or replace clogged aerators or shower heads.
- Check if your water pump is running and producing enough pressure.
4. Reset The Unit
Sometimes, the control board simply needs a reset.
- Turn off the water heater using the control panel.
- Disconnect power for 30 seconds (either the fuse or battery).
- Reconnect and try again.
This clears minor glitches in the electronics.
Decoding Error Codes
The GSWH-2 uses error codes to help you find the problem quickly. If you see a code on the display, refer to this guide:
| Error Code | Meaning | Basic Solution |
|---|---|---|
| E1 | Ignition failure | Check propane, power, air in line |
| E2 | Flame lost | Check gas pressure, venting, reset unit |
| E3 | Overheat | Clean heat exchanger, check water flow |
| E4 | Temperature sensor error | Inspect sensor wiring or replace sensor |
| E5 | Low water flow | Increase flow, check pump and screens |
Write down the code before you reset the unit. This saves time if you need more help later.
Credit: device.report
No Hot Water: Step-by-step Troubleshooting
If you turn on the hot tap and get only cold water, follow these steps:
1. Confirm Water Flow
If the water trickles or stops, the heater won’t activate.
- Test with different faucets.
- Listen for the water pump running.
- Clean aerators and check for blockages.
2. Check Control Panel
Is the power light on? If not, check power and fuses as above.
3. Listen For Ignition
When you open the hot tap, you should hear a click and a faint “whoosh” as the burner lights.
- No sound: Possible electrical or control board issue.
- Clicking but no flame: Check propane supply.
- Multiple tries then error: Air in gas line or faulty ignitor.
4. Inspect The Burner And Exhaust
Look for debris, spider webs, or soot around the burner and exhaust. These can block combustion and stop the heater from working.
- Clean with compressed air if needed (after turning off power and gas).
- Never use sharp objects that could damage components.
5. Test Temperature Setting
The default set temperature may be too low. Try increasing it on the control panel.
6. Check For Error Codes
If you get an error code, follow the earlier chart for solutions.
Water Temperature Fluctuates
Water that goes from hot to cold and back again is frustrating. This usually points to flow or sensor problems.
1. Check Water Pressure
Low or changing pressure makes the heater cycle on and off. Make sure your water pump is in good condition and water filter is clean.
2. Avoid Mixing Cold Water
Don’t open the cold tap while using hot water. This can confuse the temperature sensors and cause the burner to shut off.
3. Clean Inlet Filter
There is a small screen at the water inlet. If it gets clogged, water flow drops and the burner may turn off.
- Shut off water, remove the filter, rinse it under running water, and reinstall.
4. Inspect Temperature Sensors
Sensors can fail or get dirty over time. If cleaning doesn’t help, you may need a replacement.
Advanced tip: If you use a water softener, high salt levels can sometimes coat sensors and cause erratic readings.
Burner Will Not Ignite
If you hear repeated clicking but no flame, or get error E1, focus on ignition and gas supply.
1. Purge Air From Gas Lines
After changing tanks, air can get trapped. Try lighting the stove for a minute to clear air, then retry the water heater.
2. Inspect Ignitor Electrode
Look through the inspection window for a spark when the unit tries to ignite. If there’s no spark:
- Check electrode wiring for damage or corrosion.
- Clean the electrode tip gently.
- Replace if damaged.
3. Test Gas Valve
If you get a spark but no flame, the gas valve may not be opening.
- Listen for a soft “click” when ignition starts.
- If not, the valve or control board could be faulty.
Beginner mistake: Forgetting to open the propane tank valve fully will prevent ignition even if the tank is full.
Error Codes And Advanced Diagnostics
Sometimes basic troubleshooting isn’t enough. Here’s how to tackle persistent or advanced problems.
E1: Ignition Failure
- Check for propane at the burner.
- Test voltage at the control board (should be 12V DC).
- Inspect all wiring harnesses for loose or damaged connections.
E2: Flame Lost
- Look for wind blowing out the flame (common on windy days with exterior vents).
- Make sure the exhaust is not blocked.
- If the problem happens after a few seconds, it’s often a sensor or gas pressure issue.
E3: Overheat
- Reduce temperature setting.
- Clean the heat exchanger of scale and debris.
- Ensure water flow is strong enough.
E4: Temperature Sensor Error
- Unplug and re-plug sensor connectors.
- Replace sensor if error remains.
E5: Low Water Flow
- Increase water pressure.
- Clean inlet filter and aerators.
- Check for partially closed valves.
Pro tip: If you repeatedly get the same code, record the conditions (weather, how long after starting, etc.)—this helps technicians diagnose intermittent faults.
Diagnosing Electrical Issues
Many users overlook electrical problems, but they are a common cause of GSWH-2 failures.
1. Test Battery Voltage
Use a multimeter to check voltage at the water heater terminals. Anything under 10. 5V may cause malfunction.
2. Inspect Fuses And Breakers
Replace blown fuses with the same type and rating. Check for loose fuse holders.
3. Examine Wiring Harness
Look for signs of:
- Melted insulation
- Loose connectors
- Corrosion at contact points
4. Control Board Failure
If all else fails, the main control board could be defective. This is rare, but possible after lightning strikes, water leaks, or old age.
Mechanical And Component Issues
While most GSWH-2 problems are electrical or gas-related, some mechanical faults can occur.
1. Blocked Heat Exchanger
Hard water can cause mineral buildup, reducing efficiency or blocking flow. Regularly flush the heater with vinegar or a descaler.
2. Sticking Gas Valve
A sticky valve may not open or close fully, causing intermittent heat. Tap gently or replace if faulty.
3. Exhaust Blockages
Spider webs, mud daubers, or leaves in the vent can cause ignition failures and overheat errors.
Insider tip: Using a vent cover when parked prevents most insect blockages.
Credit: www.reddit.com
Preventive Maintenance
Preventing problems is easier than fixing them. Follow these maintenance steps for reliable hot water:
- Flush the heat exchanger every 6-12 months with white vinegar to remove scale.
- Clean the water inlet screen and shower heads monthly.
- Check for propane leaks and test all appliances at least twice a year.
- Inspect wiring and connectors for corrosion or looseness.
- Keep the exhaust vent clean and covered when not in use.
Regular maintenance extends the life of your GSWH-2 and reduces emergency repairs.
When To Call A Professional
Some problems are best left to certified technicians, especially if you’re not comfortable with gas or electrical systems.
Call for help if:
- You smell propane and cannot find the source.
- The unit has visible damage, water leaks, or melted wiring.
- Replacing a sensor or control board does not fix the error.
- You’re unsure about any repair step.
Safety warning: Never bypass safety switches or modify the heater. This can cause dangerous conditions or void warranties.
Comparing Gswh-2 With Other Rv Water Heaters
How does the GSWH-2 stack up against other RV water heaters? Here’s a quick comparison:
| Feature | GSWH-2 | Traditional Tank | Other Tankless |
|---|---|---|---|
| Hot Water Supply | Endless | Limited (6-10 gal) | Endless |
| Startup Time | Instant | 10-20 mins | Instant |
| Energy Use | Efficient | Higher standby loss | Efficient |
| Size | Compact | Bulky | Compact |
| Maintenance | Moderate | Low | Moderate |
Common Mistakes And How To Avoid Them
Many GSWH-2 owners make similar errors. Avoid these to prevent headaches:
- Not cleaning the water inlet filter: A clogged filter is a top cause of low flow errors.
- Forgetting to open propane valves fully: Even a half-turn closed can stop ignition.
- Running on low battery power: Always check your RV’s battery charge before troubleshooting.
- Ignoring error codes: Always write down and research error codes—don’t just reset and hope for the best.
- Skipping regular flushing: Hard water buildup kills efficiency and increases repair costs.
Credit: support.lci1.com
Practical Examples: Real-world Gswh-2 Problems
Example 1: No Hot Water After Winter Storage
You turn on the hot tap, and nothing happens.
- Battery is low after storage; water heater won’t start.
- Solution: Recharge battery, check for blown fuse, reset unit.
Example 2: E5 Error While Showering
Mid-shower, you get cold water and an E5 code.
- Cause: Clogged shower head and low water pump output.
- Solution: Clean shower head, replace water pump filter.
Example 3: Intermittent E2 Error On Windy Days
On windy camping days, the heater shuts off with E2.
- Cause: Wind blowing out flame via exterior vent.
- Solution: Park RV facing away from wind, use a vent shield if possible.
Example 4: Strange Odor From Exhaust
You notice a burning smell and error E3.
- Cause: Soot buildup in burner and heat exchanger.
- Solution: Clean exhaust and burner area, flush heat exchanger.
Advanced Troubleshooting: Testing Components
If you have a multimeter and some experience, you can test individual parts:
1. Check Ignitor Continuity
Unplug the ignitor and measure resistance (should be a few ohms). Infinite resistance = broken ignitor.
2. Gas Valve Operation
With the heater on, measure voltage at the gas valve terminals. No voltage = control board problem; voltage but no “click” = faulty valve.
3. Temperature Sensor Testing
Remove the sensor and check resistance at room temp (usually 10-20 kΩ). Out-of-range readings mean replacement is needed.
Expert insight: Always turn off power and propane before removing any covers or testing components.
How To Reset The Gswh-2 Properly
A proper reset can fix many issues:
- Turn off the heater at the control panel.
- Remove the fuse or disconnect the 12V power.
- Wait at least 30 seconds.
- Restore power and turn the unit back on.
If problems remain after a reset, continue troubleshooting as described above.
Replacement Parts And Where To Buy
Common replacement parts for the GSWH-2 include:
- Ignitor electrode
- Temperature sensor
- Control board
- Water inlet filter
- Gas valve
Always use genuine Girard parts for safety and warranty reasons. These are available from RV supply stores, online retailers, or the manufacturer’s website. For reliable sources, visit the official Girard RV site.
Maintenance Schedule: At-a-glance
Keep your GSWH-2 in top shape with this schedule:
| Task | Frequency |
|---|---|
| Flush heat exchanger | Every 6-12 months |
| Clean inlet filter | Monthly |
| Check wiring & fuses | Every 3 months |
| Inspect vent & burner | Every 6 months |
| Test all functions | Before each trip |
Safety Considerations
Never ignore these safety guidelines:
- Always shut off propane and power before servicing.
- Never block exhaust vents.
- Use only approved replacement parts.
- Test for gas leaks after any repair.
- If in doubt, call a professional.
Frequently Asked Questions
How Do I Reset My Girard Gswh-2 Tankless Water Heater?
Turn off the heater at the control panel, remove the power fuse or disconnect the battery for 30 seconds, then restore power and turn the unit back on. This clears most minor errors and resets the control board.
Why Does My Gswh-2 Keep Showing The E5 Error Code?
The E5 code means low water flow. Clean the water inlet filter, check all faucet aerators, and make sure the water pump is running well. Low battery power can also reduce flow if you use an electric pump.
What Should I Do If I Smell Gas Around The Water Heater?
Immediately turn off the propane at the tank, open windows, and evacuate the area. Do not use any switches or flames. Call a qualified technician to check for leaks and repair the system before using it again.
Can I Install A Girard Gswh-2 Myself, Or Do I Need A Professional?
While many RV owners install their own units, it’s best to have a professional do it if you’re not comfortable with propane or electrical systems. Mistakes can be dangerous and may void your warranty.
How Often Should I Flush The Gswh-2 To Prevent Scale Buildup?
You should flush the heat exchanger every 6 to 12 months, depending on your water hardness. Use white vinegar or an approved descaler to keep the system clean and efficient.
Keeping your Girard GSWH-2 tankless water heater in good working order isn’t difficult if you follow these troubleshooting and maintenance steps. By understanding how the system works, learning to read error codes, and practicing regular care, you’ll enjoy endless hot water on every adventure. If you ever face a problem you can’t fix, don’t hesitate to contact a certified RV technician for help.