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Problem diagnosis · SolarEdge

SolarEdge not producing — no generation from HD-Wave inverter

Your SolarEdge shows sunshine but zero generation. The monitoring portal shows the inverter online but power output is stuck at 0W. We walk you through SetApp diagnostics, DC isolator checks, and optimiser fault isolation — step by step.
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  • Works with all HD-Wave models
  • No fix, no fee
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SolarEdge not producing despite good weather. Share your SetApp alerts or monitoring portal screenshot and we'll identify the fault path remotely.

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Safety: Do not touch DC cabling or open the inverter enclosure. All checks on this page use the monitoring portal and SetApp only.

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What an Amazing service and so helpful . I have had problems with a faulty GivEnergy inverter and Ron has been so diligent in investigating and reporting on it . I’d give him more than 5 stars if I could for his help in diagnosis and potential solution. Thoroughly recommend .

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I reached on behalf of a friend, who had lost control of their battery following a storm. A couple giv energy “dealers” had attempted and said different fixes. None worked. Solar tech support solved it remotely on the first attempt almost instantly. Genuinely a 10/10 service.

Will Jay · Jun 2026 Google

This company are a rare gem, I had a very unusual problem following a failed firmware upgrade on my GivEnergy kit. I then found out GivEnergy were in administration and had dismissed all their support staff! None of the usual fixes to try and restore my inverter comms would work, and I looked everywhere, forums, GivEnergy youtube support videos - even AI couldn't figure it out. My installer was talking about huge sums for system replacements, and being vague / evasive about if they'd even install replacement GivEnergy inverter. Enter Solar Tech Support, reassuring and knowledgeable from the very start, I've learnt loads about my solar system though the friendly chat while my engineer worked as he diagnosed the problem and figured out a fix procedure that I've not found anywhere else - amazing. If you need solar system repairs - especially if you like me have been left high and dry by GivEnergy, I cannot recommend this company enough. Give them a call.

Andy Thomas · Apr 2026

A superb service from Ron who went beyond the normal service received from other Tech support companies. I live abroad and was badly let down when my givenergy system failed (and the company went bankrupt) and the local supplier ran away from the problem. Ron sorted the problem and even accessed specialist coding for the inverter that would not be available for suppliers. Ron also ran a full diagnostic to insure that all was in good working order afterwards. Without Rons support and patient assistance I doubt I would ever have got the system back up and running. Well done and thankyou and you have a customer for the future.

Philip Davey · Jun 2026 Google

Ron responded very promptly regarding my GivEnergy battery issue, his knowledgeable diagnosis was spot on and resolved the issue on first attempt. Would recommend to any and all.

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Jackie Palman · Jun 2026 Google
SolarEdge hub All problems No production Red light Arc fault HD-Wave failure Optimiser N/A Comms failure Fault codes →

Safety: Do not open the inverter or touch any DC cabling. If you discover a fault code suggesting a DC wiring issue or arc fault, isolate the DC and AC switches and contact a qualified engineer immediately.

Diagnostics

5-step diagnostic to find the no-production cause

Follow these steps in order. Most no-production faults are found in the first two checks.

1

Check SetApp / monitoring portal for active alerts

Open the SolarEdge monitoring portal (monitoring.solaredge.com) or SetApp on your phone. Look for the Alerts or Status section. Write down any fault codes you see. The most common codes are:

P404 = Optimiser pairing lost (communication failure)
P401 = Output below expected (string connectivity or optimiser fault)
P700 = Arc fault detected (safety protection triggered)
G codes = Grid voltage/frequency fault

If no fault code appears but production is zero, move to Step 2.

2

Check DC input voltage — DC isolator and fuses

In the monitoring portal, find the Inverter Details or Live Data section. Look for "DC Input Voltage" or "DC Volts". A healthy system should show 300–450V depending on the time of day and array size. If it shows 0V:

• DC isolator is off — Check the isolator switch on your main DC breaker board. It should be in the ON position (switch down or handle pointing to the line).
• String fuses blown — There are usually 1–2 fuses between the array and the inverter. A blown fuse will read 0V. You may smell a burning smell or see discolouration near the fuse holder.
• Open-circuit wiring fault — A disconnected or damaged DC cable or connector will also give 0V. This requires a qualified engineer to diagnose and fix.

If DC volts show 0V, start with checking the DC isolator. If it's on and fuses are intact, you likely have a wiring issue — stop here and contact a qualified engineer.

3

Check optimiser status in SetApp — P404 and P401 analysis

Open SetApp and navigate to the Inverter Status or Optimiser Overview. Review each optimiser in the list. Look for patterns:

All optimisers show P404

This is a string-level problem. The inverter cannot communicate with any optimisers. Most likely cause: damaged DC wiring, loose connector, or blown string fuse.

1–2 optimisers show P404

Those specific optimisers have failed or lost DC power. The rest of the array should still produce. Affected units need replacement.

Note which optimiser(s) show fault codes — you'll need this information for your engineer or warranty claim.

4

Check AC isolator and grid connection

SolarEdge will not produce if disconnected from the grid, even if the DC side is fully operational. Check two things:

AC isolator switch — Find the AC isolator (usually a manual switch on your main AC breaker board). It should be in the ON position.
Grid voltage in monitoring — In the portal, check the AC voltage reading under Inverter Details. It should show your normal grid voltage (230V for single-phase UK). If it shows 0V, there's a grid connection fault or the AC isolator is off.

If the AC isolator is on and the portal shows 0V AC, the problem is downstream of the isolator — likely a tripped circuit breaker or grid connection fault. Check your main board for tripped breakers.

5

Check for SetApp firmware lockout — post-update commissioning

If no-production started after a firmware update, the inverter may have triggered a commissioning lockout. SetApp may display "System incomplete" or similar messaging. Try a brief manual power cycle:

1. Switch the DC isolator to OFF. Wait 10 seconds.
2. Switch the AC isolator to OFF. Wait 60 seconds.
3. Switch the AC isolator back ON. Wait for the inverter to boot (5–10 seconds).
4. Switch the DC isolator back ON.
5. Check SetApp — the inverter should resume normal operation.

If the problem persists after a full power cycle, the inverter may need formal re-commissioning through SetApp (this requires Bluetooth access during setup). Contact your installer or a qualified SolarEdge engineer.

How SolarEdge architecture affects no-production diagnosis

SolarEdge HD-Wave inverters use power optimisers mounted on each panel. Unlike string inverters where one fault can kill the entire array, individual optimiser faults reduce output proportionally — if one of eight optimisers fails, you lose about 12.5% of production, not 100%. This is why the monitoring portal's panel-level data is so valuable for diagnosis.

SetApp is the configuration and commissioning tool. It communicates with the inverter over Bluetooth during setup and provides real-time fault codes and optimiser status. The monitoring portal (accessible online) shows historical data and per-panel production. Common no-production fault codes: P404 (optimiser communication lost), P401 (output below expected), P700 (arc fault detection).

A DC isolator or blown fuse will cause immediate and complete loss of DC power — the monitoring portal will show 0V DC input. An AC isolator fault or grid disconnection will cause the inverter to stop producing even though the DC side shows full voltage — the portal will show 0V AC and the inverter will display a grid fault code.

Related problems
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FAQ

Common SolarEdge no-production questions

No production usually means either: (1) a DC power issue — tripped DC isolator, blown fuse, or wiring fault; (2) an AC grid disconnection; or (3) an inverter/optimiser fault code that's blocking operation. Check SetApp for active alerts first. If you see P404, P700, or P401, that's your specific fault path.
P404 means the optimiser has lost communication with the inverter. If all optimisers show P404, the problem is at the string level — usually a wiring fault, loose connector, or blown fuse. If only one or two units show P404, those specific optimisers have failed or lost DC power and need replacement.
Yes — an isolation fault is one of the most common reasons a SolarEdge sits at 0W in otherwise perfect sun. It is flagged in SetApp as an isolation or low insulation-resistance (Riso) alert — some owners see it as an Error 18xx code — and it means the inverter has detected that the DC side's insulation to earth has dropped too low, so it stops generating as a safety measure rather than risk a leakage current. Common causes are water getting into a connector or junction box, damaged or pinched DC cable insulation, a faulty panel or optimiser, or simply heavy damp after rain (some isolation faults clear on their own once everything dries out). Because it is a live-DC earth-insulation problem, it needs an engineer with an insulation-resistance (Megger) tester to find the leak safely — don't open the DC side yourself.
If the portal shows optimisers as 'offline' or 'N/A' but the inverter display is lit and the portal is responding, the inverter is powered but those specific optimisers aren't communicating. This indicates a local fault with those units (or their DC wiring), not a total system failure. Check SetApp for the specific fault code to identify which optimisers are affected.
Only if it's a simple isolator or configuration issue. Checking that DC and AC isolators are on, resetting after a firmware update, and reviewing SetApp settings are safe. If you find a fault code (P404, P700) or suspect a wiring issue, stop and contact a qualified engineer — do not open the inverter or touch DC cabling.
The remote diagnostic is free — send your SetApp alerts or a monitoring screenshot and we'll work out the fault path at no charge: whether it's a DC or AC isolator you can switch back on, a firmware lockout that clears with a reset, or a hardware fault that needs a visit. If we can sort it remotely — a setting, a re-commission, or talking you through a safe reset — there's a flat £95 fix fee, and nothing if we can't. If it needs hands-on work, such as an isolation-fault leak hunt, a failed optimiser, or DC string repair, that's an on-site visit from £295; a failed optimiser or inverter still inside warranty is replaced with the unit supplied free by SolarEdge. You'll always get the cost up front.
Most no-production faults are diagnosed in a single same-day remote session once you send your SetApp alerts — we can usually identify the cause within about 30 minutes. If it turns out to be a reset or a setting, you could be generating again the same day. If it needs an engineer on site (an isolation-fault hunt, an optimiser or DC repair) we'll book the visit, and most are completed in one appointment; a warranty inverter or optimiser replacement then depends on SolarEdge's turnaround, typically 2–4 weeks for the part. Every day at 0W is lost generation, so it's worth starting the diagnostic quickly.
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