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Zwc28 1mf2k31 poor flame

9 yr old and runs on propane, only reaches 40 degrees temperature unless on slow trickle on tap. Then can eventually make 60. Flame seems too weak. Have just changed external regulator without any improvement. Have tested temperature mainly at sink near boiler. Effects upstairs in the bathroom even worse. Seems to have got worse over last 2 years. Spanish technician says there is nothing wrong with it!

Posted by Anonymous on


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  • Water Heaters Master
  • 3,182 Answers

Check in coming water flow . Check water flow at heater maybe blocked inside reduced flow .

Posted on Aug 01, 2017


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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

  • 17 Answers

SOURCE: Ariston Combi euro boiler SX20 MFFICE 970903039 GC No 4711602

have you tried to put some cleaner into the system it siounds like you may have a circulation problem

Posted on Nov 27, 2008

  • 68 Answers

SOURCE: boiler keeps losing pressure when the heatings off

Hi Leehardcast,

Yes the problems are related. The system is low on water. So now instead of water you have air in radiators which is easily compressed when it heats up. Then pressure loss when it cools down.

Add some water to your system until you have 15lb pressure and bleed out upstairs radiators at the same time.

Please rate this response and Good luck, Phil

Posted on Jan 14, 2009

  • 9 Answers

SOURCE: Halstead boiler reluctant to stay on

next time it turns off let it cool and clean with a cotton swab with rubbing alcohol after brushing.

Posted on Sep 08, 2009

  • 248 Answers

SOURCE: Vaillant ecoMAX 828/2boiler goes on & off when running hot water!

water must be set at 3lts a min ,check diaphragm valve move when hot tap is on, check microswitch ,best of luck

Posted on Oct 12, 2009

  • 78 Answers

SOURCE: Model 22V40F1 40-gals unit. Pilot lights up OK but won't stay lit

change the thermcouple

Posted on Feb 17, 2010

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2 Answers


change the gas valve, if the thermocoupling works and the piliot stays lit then it has to be the gas valve check to make sure the screen is clear also,, you said it's propane, check to make sure it is all the way turned on, and has the right pressure it might have a bad regulator on it, but will let other things in the house run good luck

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