HVACopediaFlowMax · Combi boiler
Summer mode symbol Summer mode selected (hot water only)
What the display is showing
The summer-mode symbol stays lit steadily when summer mode is chosen with the mode button. The unit then serves only the domestic hot water. The symbol flashes while the burner is running for a hot water demand.
Applies to: FLOWMAX-90 and FLOWMAX-120 combi
Settings for these units
Installation clearances · FlowMax condensing combi (FLOWMAX-90/120)
| Location | Service clearance (in) | To combustibles |
|---|---|---|
| X (side) | 0 | 0 in |
| Y (side) | 0 | 0 in |
| L | 16 | - |
| H | 24 | - |
| A (above) | 12 | 0 in from jacket top |
| B (below) | 12 | - |
| Front | - | 0 in |
| Rear | - | 0 in |
Wall-mount on a flat, solid vertical wall that can carry the weight.
Letters follow fig. 1 of the manual; L and H are the clearance zone in front/around the unit as drawn.
Hot water scald risk by temperature · FlowMax condensing combi (FLOWMAX-90/120)
| Temperature setting | Time to 2nd/3rd degree burn (adult skin) |
|---|---|
| Over 170°F | Nearly instantaneous |
| 160°F | About 1/2 second |
| 150°F | About 1-1/2 seconds |
| 140°F | Less than 5 seconds |
| 130°F | About 30 seconds |
| 120°F or less | More than 5 minutes |
120°F lowers scald risk; children, elderly and disabled people burn faster.
Fit a tempering (mixing) valve if water is stored or set hotter, e.g. with parameter 1 = 03 (up to 160°F).
Models that show this code
2 models in FlowMax condensing combi (FLOWMAX-90/120)
Other codes on the same units
- E16 Fan (blower) fault
- E22 Parameter programming request
- E35 Flame detection fault (false flame)
- E42 Fan speed control board fault
- H2O Low water pressure in heating circuit
- Outdoor temp Outdoor temperature readout
- Summer/Winter mode symbols Summer and winter mode selected (heating and hot water)
- Winter mode symbol Winter mode selected (heating only)
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Source: FLOWMAX-90 User Manual, Starting-up / Summer mode, p.7; FLOWMAX-120 Instruction Manual, 4.5 Starting up, p.38. Summarized in our own words; check the original manual for your model.
For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.