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14

6.1 Faults and fixes

If problems arise when the product is in use, 
check for possible faults and fixes in the table.
If you are unsure what is wrong, contact the 

6. TROUBLESHOOTING

installer (see product type plate) or OSO Hot-
water AS - see section 7.1 (page 18).

TROUBLESHOOTING

Problem

Possible cause of fault

Possible solution

There is leakage/drip-

ping from the safety 

valve/there is often 

water on the floor by the 

cylinder in the morning

Pressure reduction valve, water meter 

or blocked non-return valve on the 

water intake.

Water pressure into the system is too 

high.

Check the expansion vessel/s air pressure 

settings and recharge if incorrect. Check 

the cold water supply pressure and follow 

the guidelines described in point 3.5.1.

The safety valve is worn or there are 

particles stuck between the mem-

brane and the valve seat because the 

water is dirty

Try to flush with water through the safety 

valve. Open valve for approx. 1 minute. See 

section 5.2. If the valve still leaks, it must be 

replaced. Contact auth. installer.

Leak from heating element.

Verify as follows: a) cut the electric sup-

ply, b) unscrew the cover, c) visually check 

whether there is a leak from the heating 

element. If so, replace the gasket/heating 

element. Contact auth. installer.

No hot water

Power supply interrupted (if fitted).

Verify that the power supply is working 

correctly and the main breaker has not 

tripped.

Thermostat has cut out (if in use).

Press the ‘RESET’ button on the safety 

thermostat; see ‘User guide’.

Heating element is defective (if 

fitted).

Replace heating element. Contact auth. 

installer.

Leak in hot water pipe

Verify as follows: a) close the water sup-

ply, b) wait 2-3 hours, c) touch the tank 

to see whether it is hot. If so, there is a 

leak in the hot water pipe or elsewhere. 

Contact auth. installer.

Not enough hot water

High consumption in the system.

Switch to a larger OSO water heater. 

Contact auth. installer.

Not high enough tem-

perature

The thermostat (if fitted) is set for 

low temperatures.

Check the thermostat settings. Turn up 

to 75°C, see manual supplied with the 

OSO electric peak load package.

Crossover bleed/flow from cold to 

hot water in taps.

Contact auth. installer.

Fuse/earth breaker trips 

repeatedly

Possible fault in the water heater 

electrical system (if fitted).

Verify as follows: a) cut the electric supply, 

b) unscrew the cover, c) visually check the 

junction box for any problems. If so, con-

tact auth. installer to check. Fit the cover.

Long time before the 

water reaches the tap

Long stretch of pipe from water 

heater to tap.

Check secondary circulation pump 

and pipework is installed correctly and 

working as required.

Knocking in the pipes 

when the hot tap is 

closed

Large pressure increase when the 

tap is closed quickly.

Completely normal. Fit an additional ex-

pansion vessel or shock arrestor in the 

CF supply line. Contact auth. installer. 

Summary of Contents for Maxi Standard - MS

Page 1: ...Maxi Standard MS 600 1000 l EN 146233 00 10 2021 SAFETY INFORMATION O M INFORMATION INSTALLATION MANUAL...

Page 2: ...luded in delivery 6 3 3 Product dimensions 6 3 4 Requirements for installation location 7 3 5 Pipe installation 8 3 6 Electrical installation optional 11 4 Initial commissioning 12 4 1 Filling with wa...

Page 3: ...y are accessible for fu ture reference The manufacturer assumes compliance by the end user with the safety oper ating and maintenance instructions sup plied and by the installer with the fitting manua...

Page 4: ...be carried out by persons over 18 years of age with sufficient understanding CAUTION The product must not be exposed to frost over pressure over voltage or chlorine treatment See warranty provisions M...

Page 5: ...ure Equipment Directive PED 2014 68 EU Safety standard EN 60335 2 21 Welding standard EN ISO 3834 2 OSO Hotwater AS is certified for Quality ISO 9001 Environment ISO 14001 Work environment ISO 45001 2...

Page 6: ...mm Tolerance 50 0 mm 3 INSTALLATION INSTRUCTIONS 3 1 Products covered by these instructions MS 600 MS 1000 3 2 Included in delivery 2 3 1 4 C A B Ref no Pcs Description 1 1 Buffer tank with optional...

Page 7: ...with Building Regulation G3 England and Wales Technical Standard P3 Scotland or Building Regulation P5 Northern Ireland and the Water Fitting Regulations England and Wales or Water Byelaws Scotland T...

Page 8: ...nnecting pipes 3 5 3 Fitting of overflow pipe The discharge pipe from the T P safety valve shall be at least one pipe size larger than the nominal outlet size of the safety device 9m length The discha...

Page 9: ...and and Wales or Water Byelaws Scotland The product shall be properly aligned vertically and horizontally on a floor suitable for the total weight of the product when in operation See type plate The p...

Page 10: ...in blocks of flats the number served should be limited to not more than 6 systems so that any installation discharging can be traced reasonably easily The single common discharge pipe should be at lea...

Page 11: ...tration OSO supplies equipment packages for electrical installation complete with their own installation manual with wiring diagram please contact your OSO supplier for details Fixed electrical fittin...

Page 12: ...ing firmly verti cally and horizontally 4 4 Handover to end user 4 INITIAL COMMISSIONING THE INSTALLER MUST Brief the end user on safety and maintenance instructions Brief the end user on settings and...

Page 13: ...Inspection of anode Turn off power and water sup 5 USER GUIDE MAINTENANCE INSTRUCTIONS Maintenance should be carried out by persons over 18 years of age with suf ficient understanding Annual inspecti...

Page 14: ...ower supply is working correctly and the main breaker has not tripped Thermostat has cut out if in use Press the RESET button on the safety thermostat see User guide Heating element is defective if fi...

Page 15: ...th the appropriate Building Regulations 3 Failure to install and commission this appliance to the manufacturer s instructions may invalidate the guarantee The above does not affect your statutory righ...

Page 16: ...FFERENT NAME DATE ADDRESS TEL No REGISTERED OPERATIVE ID CARD No IF APPLICABLE REGISTRATION DETAILS IT IS THE RESPONSIBILITY OF THE INSTALLER TO COMPLETE THIS LOGBOOK AND PASS IT ON TO THE CUSTOMER FA...

Page 17: ...HAT IS THE PRESSURE REDUCING VALVE SETTING IF FITTED WHERE IS OPERATING PRESSURE REDUCING VALVE SITUATED NO YES NO bar HAS THE EXPANSION VESSEL OR INTERNAL AIR SPACE BEEN CHECKED YES NO WHAT IS THE HO...

Page 18: ...r latest version The water should not be aggressive i e the water chemistry shall comply with the following Chloride 250 mg L Electric Conductivity EC 25 C 750 uS cm Saturation Index LSI 80 C 1 0 0 8...

Page 19: ...COMMENTS SIGNATURE DATE ENGINEER NAME SERVICE 5 COMPANY NAME TEL No COMMENTS SIGNATURE DATE ENGINEER NAME SERVICE 7 COMPANY NAME TEL No COMMENTS SIGNATURE DATE ENGINEER NAME SERVICE 9 COMPANY NAME TE...

Page 20: ...twater co uk E mail sales uk oso hotwater co uk Manufactured by OSO Hotwater AS Industriveien 1 3300 Hokksund Norway Tel 47 32 25 00 00 oso oso no www osohotwater com This installation manual and all...

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