SolaX Inverter Repair and Fault Codes
Isolation Fault on the screen, a battery voltage fault, or backup power that keeps cutting out? We diagnose and repair SolaX inverters from any installer, across England, Wales and Scotland.
Repairs you can rely on
- MCS registered
- NAPIT registered
- TrustMark approved
- Fully insured
- Any installer’s system
- In-house engineers — no subcontractors
Call us on 0800 156 0191
Monday to Friday, 9:00am–5:00pm
Is this what you’re seeing?
An IE fault code on the inverter’s display
Isolation Fault or IsoFault on the screen
Bat Volt Fault on a SolaX hybrid system
Backup (EPS) power cutting out when appliances are on
The inverter stuck on Waiting in good daylight
The monitoring shows the inverter offline
The solar breaker in the consumer unit keeps tripping
Note the IE code and the model name on the inverter’s label.
Call 0800 156 0191 or use the fault finder further down this page. If the solar breaker keeps tripping, leave the system switched off until an engineer has looked at it.
Common SolaX faults
SolaX inverters show faults on the display as a code and a short name, such as IE 13 Isolation Fault. SolaX’s hybrid inverters, which run a battery, and its grid-tied X1-Boost inverters use different numbering, so the model matters as much as the code. We install solar and battery systems too, so we know how these faults show up in real homes.
Isolation faults
IE 13 on SolaX hybrid inverters, or IE:00020 IsoFault on the X1-Boost G4, means the insulation between the panel wiring and earth has dropped too low. SolaX’s guidance includes checking the wiring insulation for damage, which means testing the array. That’s a job for an engineer.
Battery and panel voltage faults
Bat Volt Fault (IE 07) means the battery voltage is outside the range the inverter accepts, and PV Volt Fault means the voltage from the panels is too high. Both need measuring before anything is changed. Faults reported by the battery itself show as BE codes instead, and we can diagnose those too.
Backup power overloads
On a hybrid system with backup (EPS) power, IE 16 EPS Overload Fault means too much is plugged into the backup supply. SolaX’s advice is to switch off the high-power appliance and press ESC on the inverter. If it keeps happening with normal loads, or you see IE 29 EPS Relay Fault, the backup side needs checking.
Waiting
Waiting isn’t a fault. It’s a normal state while the inverter waits for the right conditions to start, and it’s common at dawn, at dusk and in low light. An inverter that never moves past Waiting in good daylight needs checking.
Repair or replace?
We always diagnose first: many SolaX faults are in the wiring, the battery connection or the settings rather than the inverter. If replacement is the better option, you get a clear written quote before any work starts. Read more about inverter repair and replacement, or how we find faults across the whole system.
SolaX error codes and what they mean
The codes below come from SolaX’s user manuals for the X1-Hybrid G4 and X3-Hybrid G4 (hybrid inverters) and the X1-Boost G4 (grid-tied). Other SolaX models, such as the X1-Mini and X1-Fit, aren’t covered here.
| Code | What it means | What to do |
|---|---|---|
| IE 13 Isolation Fault (X1/X3-Hybrid G4); IE:00020 IsoFault (X1-Boost G4) | The insulation between the panel wiring and earth has dropped too low | Wait to see if it clears. If it doesn’t, or it comes back, call an engineer to test the wiring. |
| IE 07 Bat Volt Fault (hybrids) | The battery voltage is outside the range the inverter accepts | Call an engineer to check the battery and its connection. |
| IE 05 PV Volt Fault (hybrids); IE:00009 PVVoltFault (X1-Boost G4) | The voltage from the panels is too high | Call an engineer to check the panel voltage. |
| IE 16 EPS Overload Fault (hybrids) | Too much load on the backup (EPS) supply | Switch off the high-power appliance and press ESC on the inverter. If it doesn’t clear, call us. |
| IE 29 EPS Relay Fault (hybrids) | A fault with the backup (EPS) relay | Call an engineer. |
| IE 102 Port OC Warning (hybrids) | Over-current on the backup port | Check the backup load isn’t too high, then press ESC. If it comes back, call us. |
| Waiting | Normal: the inverter is waiting for the conditions it needs to start | Nothing to do at dawn, dusk or in low light. If it never moves past Waiting in good daylight, call us. |
When to call an engineer
Call us if you see any of these:
- An Isolation Fault that doesn’t clear or keeps coming back
- Bat Volt Fault or PV Volt Fault
- EPS overloads with normal loads, or an EPS relay fault
- Any IE or BE code that isn’t in the table
Checking insulation, voltages and connections is work for a qualified engineer. Beyond reducing the backup load and pressing ESC, don’t open the inverter or disconnect its cables or battery yourself.
Call 0800 156 0191 or use the fault finder below.
Why L&R Renewables
Any installer’s system
It doesn’t matter who fitted your SolaX inverter or whether they’re still trading.
Certified, in-house engineers
We’re MCS and NAPIT registered and TrustMark approved, and our own engineers carry out every job.
Honest about repair versus replacement
If a repair will do the job, that’s what we recommend.
England, Wales & Scotland
We cover England, Wales and Scotland.
Frequently asked questions
What does Isolation Fault mean on a SolaX inverter?
It means the insulation between the panel wiring and earth has dropped too low, often because of water in a connector or a damaged cable. It shows as IE 13 on SolaX hybrid inverters and IE:00020 IsoFault on the X1-Boost G4. If it doesn’t clear, or keeps coming back, the wiring needs testing by an engineer.
Why does my SolaX backup power keep cutting out?
Check the display for IE 16 EPS Overload Fault, which means too much is plugged into the backup supply. Switch off the high-power appliance and press ESC on the inverter. If it happens with normal loads, or you see IE 29 EPS Relay Fault, call us.
My SolaX inverter says Waiting. Is it broken?
No. Waiting is a normal state while the inverter waits for the right conditions to start, and you’ll often see it at dawn, at dusk or in low light. If it stays on Waiting in good daylight, call us and we’ll find out why.
My installer has gone bust. Can you still help?
Yes. We don’t need the original installer to be involved, and we provide the certification and documentation for any new inverter we fit.
Do you cover my area?
Our engineers cover England, Wales and Scotland. Call 0800 156 0191 or tell us your postcode in the fault finder and we’ll confirm cover for your area.
Related pages
Solar inverter repair
Repair and replacement for every major inverter brand.
Solar panel repair
Diagnosis and repair for the whole system, from any installer.
Solar panel servicing
An annual health check that catches faults early.
Tell us what your SolaX inverter is doing
Answer four quick questions — including the error code — and leave your details, and we’ll call you back to arrange a visit. Prefer to talk? Call 0800 156 0191, Monday to Friday, 9:00am–5:00pm.
Solar fault finder
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We’ll talk through what’s happening and book your initial visit. If it’s urgent, call 0800 156 0191.
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