Seven symptoms cover roughly 80 percent of service calls on Solaronics equipment in Slovenia. Below: for each one, the symptom, the most likely cause, the first diagnostic step, and a clear boundary between in-house and certified work. The aim is to reduce unnecessary service calls and raise first-visit success when a service is needed.
Before any intervention
Before starting any diagnostic step, perform three standard checks:
- Check the power supply to the main switch of the unit and the fuses in the distribution board. Half of "faulty" unit heaters have an interrupted supply after an electrical intervention.
- Check the gas supply. With the main valve closed, the unit will not start, even if the burner and electronics work.
- Note the fault code from the controller, if shown. On Solaronics burners the code is shown on the LED display or by blinking of the status light (number of blinks = code).
Without these three data points a service call takes twice as long; with them, the technician prepares the right part in advance.
Seven most common symptoms
| Symptom | Most likely cause | First diagnostic step | Your intervention or service |
|---|---|---|---|
| Unit does not ignite, no fault code | Interrupted power or closed gas | Check switch + main gas valve | Your intervention |
| Unit ignites, immediately goes out (1 to 3 seconds) | Failed ignition due to air in gas supply | Bleed air from supply after first seasonal start | Your intervention at first start, otherwise service |
| Unit cycles on safety cut-out every few minutes | Exchanger overheating (blocked airflow path) | Check filter (air curtains and unit heaters), check exchanger cleanliness | Filter: your intervention. Exchanger: service. |
| Flame is yellow or unstable instead of blue and stable | Wrong gas/air ratio or clogged nozzles | Visual assessment of flame through the sight glass | Service (measurements required) |
| Hall does not warm up, even though the unit runs (radiant plaques) | Sooted ceramic or damaged reflectors | Visual assessment of ceramic (grey or black patches = oxidation) | Service (module replacement) |
| Airflow has dropped, fan noise has risen | Clogged filter or worn bearings | Filter removal and inspection | Filter: your intervention. Bearings: service. |
| Water dripping from underside of condensing unit heater | Blocked condensate drain | Trace the drain line, check the trap | Your intervention |
The "your intervention or service" column lists what your in-house technician can do in the hall. Burner, gas/air mixture, and flue-gas work is performed only by a certified Solaronics technician. That is the condition for the warranty and regulatory burner classification.
Three deeper examples with explanation
Ignition retries three times, then locks out
On SRII radiant plaques and AC-series unit heaters the burner attempts ignition up to three times, then locks out. The cause is almost always one of two: (a) air in the gas supply after a service or idle period, (b) the ignition probe filter is oxidised and does not pass the spark.
Your intervention: bleed the gas supply via the air-release valve upstream of the unit and reset the lockout, up to three times. If the unit starts, air-in-supply was the issue. If not, call a technician; the probe filter requires certified replacement.
Hall is 4 °C colder than last year at the same settings
This is a typical symptom of efficiency drop, detected by diagnostics. Do not call a service until it is clear which of the three silent causes (clogged nozzles, modulating-valve drift, exchanger-flue seal) is at play. A service without diagnostics in this case typically "cleans everything" and the symptom returns in 2 to 3 months.
MRA air curtain does not heat, even though the fan runs
The gas module has two independent chains: fan and burner. If the burner is down but the fan runs, the problem is in the burner (gas pressure, controller). If neither runs, the problem is in the supply or a shared fuse. The two chains run independently for safety.
Your intervention: check gas pressure on the manometer upstream of the unit (18 to 30 mbar for G20). Below 15 mbar the problem is in the gas distribution or regulator, not in the unit.
When to stop using the unit
Three states require immediate shutdown and a service call. Do not wait for a scheduled slot:
- Smell of gas in the vicinity of the unit, even faint. Close the main gas valve, ventilate the space, call the gas utility and us in parallel.
- Visible glowing of the exchanger or flue to red. Overheating outside safety limits, safety cut-out not working.
- Visible cracks or deformations on the exchanger or radiant plaque. May lead to flue-gas leakage into the space.
In all three cases our response is prioritised: within 24 hours for customers with a service contract, within 48 hours otherwise.
Next steps
If the table above has identified the cause and you need a part, see spare parts. If you need engineering support to interpret symptoms, technical assistance is available during business hours. If symptoms point to a systemic efficiency drop, book diagnostics.
Send the symptom and fault code for a fast engineering reply